Lack of relationships...
I know what you mean, learning to talk to women you are interested in without crumbling is an acquired skill that takes a lot of practice. Lot's of people will say just be yourself etc, that's not always so easy when your relating differently to a woman than you are to a friend.
Relearning communication on a progressively deeper emotional level.
Perhaps you could use a few experiences of low key informal relationships with women before trying to get a girlfriend.
So you can get over feelings of being intimidated and build your self confidence (very important).
Just try to make friends. Keep it in your pants, be nice, be polite but be sassy in your own way and don't ever compromise your personal views because you don't want to offend a woman (tactfully).
If you get into a mental knot you need to be prepared for it, rehearse a few anecdotes, jokes, something that can keep you talking until you work out the glitch and slip back into a more comfortable you. Do you have tutorials at your university or smaller classes,? That's a better environment for making friends than a lecture.
Universities often have social events outside of study, they can be good opportunities to make friends with a wide variety of people. Bring your friends with you, meet people in a social environment as a group activity, that'll take the pressure off you, somewhere you can 'mingle' so if you have 5 minutes of small talk that's a start. Next time you go out and meet up with the people again, have another 5 minutes and you'll find your more comfortable every time you do it.
I am perfectly sane and normal.