teenage erectile dysfunction???

Lana
I am 17, and I have a thing with a guy who is 18 and he has never gotten hard when we hook up. I know he has feelings for me and is very attracted to me and we talk about having sex but it just doesn't happen. He tells me the reason he doesn't get hard is because he is tired but most teenage boys get hard if a girl like breathes near them. I feel awkward because he fingers me and goes down on me but I've never done anything to him and it feels unfair. I'm trying to not let it get me down and lower my self esteem but I feel really bad about it. Has this happened to anyone else this age??