I have a really huge crush on a professor at my college.I feel like Iam in love with him.I cannot even spend a minute without thinking about him.I started having a crush on him during the time I was taking the class with him, butI waited until the end of the semester(after receiving my grade) to actually start talking to him.I know that he knows that I have a crush on him since I would send him emails about every week and always ask him if I could meet him in his office.He never asked why I wanna met him.He replies me right away saying I could come..etc.I think he is also interested in me since he asked me out indirectly, but I pretended as if I did not understand since, I am scared that its embarrassing to date with a professor.He always says me that I can come to his office.he also suggested to work in his lab or help him with some problems that come up in his lab during the next semester.he gets upset when i show that I dont care about him etc.my question is since I am out of his class and will not take him again, should I confess my feelings to him.I wanted to just talk to him until I graduate and then start dating so that I should not fell guilty. But, I feel like I have to say to him since he knows that i am interested and I don't know how to go to his office without a specific reason. Also, I love him so much that i just feel like saying him right now.

BTW i always email him saying I have to see him for whatever reason.he always agrees.But, if i fail to show up, he doesnot ask me via email why I didnot show up.Like last I went to see him and waited for an hour and half since he was busy in his lab and i didnot want to disturb.When he came out I asked him if I could come at certain time, but I didnot go.He never emailed asking why I wasnot there.Is it that professors cannot email students other than educational stuff.Does that mean he doesnot care about me or their emails are monitered since he uses college email. I also noticed he wouldnot say anything else in email except answering my questions.but, in person he would just keep asking things about me and bragg about him.

Well, there are some written or unwritten rules about these cases. As for written rules, basically I would say that if you are over 18 years, it is much easier. But there are some "professional" rules for teachers, professors, doctors, therapists, employers etc-all kinds of professions where people work with other people in situations where they have potentially more power (teacher-student, therapist-client, boss-employee etc...).
Let´s go back to your situation - you seem to be quite sensible and reasonable (e.g. not starting anything intimate before you finish the course or exams with this professor etc...) and I would like to write to you my personal opinion taking for granted that you are a reasonable woman. To be honest, I would recommend you to express your feelings to him. There are many relationships and also functional marriages where the couple consists of an ex-teacher/ex-professor and his ex-student. It is nothing "dirty" or bad just because you met each other at school. Of course, if you start the relationship or sexual interactions after graduating, I personally see absolutely no problems in it. If you start before graduation, it depends on many individual and specific factors - for example his attitude is extremely important here and also I would recommend to keep it as secret as possible - other people, your schoolmates or his colleagues could spoil everything, cause serious troubles to him (in the worst scenario he could lose his job) and influence your relationship in a negative way. So, if anything happens (on a sexual or romantic or more personal basis), do not speak about it to anyone (friends, schoolmates etc - the world is small and the information could spread with the speed of light).
His way how he reacts to his emails can be caused by the fact that you are his student. keep in mind that by having some affair with him, it is he who is in a much more dangerous position - he can be accused of abusing you or of misusing his position etc, if something happens, he would be blamed much more than you, even if it is not fair, but according to these written or unwritten rules, he should be more careful and "responsible" because he is in superior position (teacher) and he is a male which can also play its role in possible accusations of seducing you etc...(even if it was you who initiate it). So his careful (or you may say "paranoid") behaviour can be caused by this. Do not interprete it as his lack of interest in you.
My advice would be - if you mean it seriously, then do not give up and go for it! You will see how he would react and whether there is a chance of a nice relationship. It is possible. Not sure - nothing is sure in the world of love, not only when professors are involved:)
But please, if you decide to go for it, be aware of the risks he is undertaking (his hesitation can be caused by this, not by his lack of interest) and moreover, if anything bad happens in the future between you and him, do not use it against him (even if you wanted to "kill" him, please do not use this potential affair as a weapon or revenge against him - but as I said you seem to be a sensitive and intelligent woman, so I hope you would never act in this mean way.).
To sum up, go for it, give it a try, show him your interest and you will see. But be careful and do not let other people know about it, it is not their business. It depends also on him, but his colleagues and your schoolmates shouldn´t know about it.
Good luck,
severin

p.s.-I used to be a teacher not long time ago.

Thanks a lot for such a nice advice.I needed someone who could understand my feelings.I never discussed it with any of my friends or even my family. Also, I am a little shy.I know can never confess my feelings to him in person.I do not know how to confess without getting him in trouble. Like, I am scared if I email or send him a letter, he might get in trouble. The other thing is what if he is married? he is 34 years old. Should I still say him?

Did you ever had a student who had a crush on when you were a teacher? if so, how did you react?

P.S I am 20 years old.