Longboard

Me and my girlfriend were up in her room and we had the best foreplay, she was very turned on. i didnt move on to sex because well.. my penis did not get hard. i was doing everything but sex. i eventually told her what was happening so she tried giving me a Bj to see if it would work. It didnt. I feel like im not a man. I dont have strong feelings for her, but i haven't been able to have strong feelings for any girl for a long time. I was a little tired, coming down from a marijuana high, (please dont think im some really bad person im not) and a little nervous but not that much since it was my first time doing that. I'm 15 years old. Please help healthboards

Edit: I take prozak for depression, and i think i might have anxiety. i also have a lot of stress in my life and i dont know how to get rid of it.