I can't get him off of my head

I'm a navy brat and I'm moving far away from where I previously lived. Anyways, I had a crush on this guy for the longest time. I never thought he would be interested in me. I mean, he could be a model and I look like a brown stick with uncontrollable hair. However, once I left, he found out that I liked him. He texted me later saying he liked for an even longer time than I liked him. I know we can't have a relationship now but it hurts because he was what I pictured in my head for my first boyfriend. I don't know how to forget him.