"Ok so the other night I did my deed on her and she called me and said she couldn't handle the feelings she was having for me and she was scared to have sex and felt pressured, which she never had stated to me.Then she went on to say that shes not ready for a relationship with me and needs to concentrate on school."
Why don't you just leave her alone? Why should she have sex with you? There are plenty of other women out there!!! Do you have some fixation on virgins? Or do you have feelings for her in general?
If you don't have a fixation on virgins - just find another girl - she'll be more experienced and more likely to be confident than this one.
Another thing - I'm about the same age as you are. What are you doing going out with a 17 year old? :/ Some guys might think this is amazing, but for a lot of women (hey it's important what we think becuase it's us you want to have sex with right?).....it looks bad - like it looks like you can't get anyone your own age - not good for your sexual rep. is it? :/
I don't think 20 years of age difference is a big deal even - but she's 17 years old....it's making you look like you might be a bit of a pervert :/
Go for someone closer to your own age and as I said - they might be more experienced. Let her concentrate on school.
You playing a dangerous game - can you imagine if she had sex with you and shock horror she regreted it?! Can you imagine the possible conversation she might have with someone else. It could run something like this -
"Well I really liked him, but one night I just felt so pressured. He was making all the moves, but I didn't really want to. I think I said no at point but I don't think he heard me....he just carried on and I just wanted it to stop".......

!!!!!!!!
This could be you. Obviously your side of the story might be completly different, but can you imagine what this would sound like to a protective male figure in her life....I would be running already!!