<human>: Can you give me the gist of the text in a nutshell?

This sounds pathetic but in high school there was this girl who I freaking loved. She was beautiful, smart, funny, and had a similar personality to me so she understood how I felt about things and I understood her. In school we would talk to each other every morning and I would make my brother(twin brother, we shared a car and somehow the agreement happened that he would drive in the mornings and I would drive in the afternoons) park in the same parking lot as her so I could talk to her a little bit longer every day,  but even when we didn't we would always find each other in the hallways. Looking back, she was obviously interested in me since she kept doing things like insisting to be my dance partner for a stupid play thing we did and sitting next to me on bus rides, and getting flustered whenever we were alone together for any length of time. I wanted to ask her out, but right when I was planning on doing it, I managed to convince myself that she hated me because of a stupid thing I said. I later realized that this wasn't the case, but managed to convince myself that she only liked me as a friend (despite the fact that she said she wanted to go to prom with me). 

I feel like a dumbass and even though I have only seen her once since high school ended I still can't get over her and how much of a dumbass I am for not seeing the signs. How do I get over this? It's effecting my current attempts at relationships because even in a perfect situation I still managed to fuck it up.
<bot>: I can't get over my high school crush and it's affecting how I currently view relationships. How do I get over her?