commitment fear?

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Relationship Problems

I've been with my girlfriend Sara for 2 years. I was 21 when we had started going out and I was still a virgin and had never had a proper relationship, so I had alot of anxiety issues to begin with over that which made me feel sick and dizzy and out of breath, I overcome this by doing the obvious.

In feb 06 Sara said that she didn't know if she wanted to be with me anymore and we split up, then 2 months later we got back together and the same thing happened, another 2 months passed and in July 18th we got back together and are still together.

2 weeks ago we were at her place for the weekend and we were being really nice to each other, we were kissing, hugging and telling each other that we love each other, them BOOM out of nowhere I started feeling anxious and, I just keep thinking that this is the girl that I want to spend the rest of my life with but am I going to be happy with her or am I going to regret it. This just makes me think do I really want to be with her etc etc My parents split up when I was 13 and it did affect me but I dont know if it would have anything to do with it.
I just want to get it sorted because I dont want to lose her and she's moving in with me in a week! She knows what I'm going through and wants to be there for me.