Sometimes I be cool

So there is this girl that I have had a crush on since the first day I saw her at school. I finally gained the courage to ask her on a date. She said yes. Yet I still feel worried. I feel like she is too good for me, way above my level. I know I shouldn't downgrade myself but I can't help it. I also am afraid that she isn't over her ex... that last thing I want is to feel used to make her ex jealous. I guess we'll see how things go. It is somewhat curious how one can date a person for a year or years, then end a relationship... then move on to someone else. I feel as though I have learned a lot from my past partners about myself. There is still much more to learn. Gah, all these feels.