Difficulties In Bed, Please Help !!

Okay, so me(15) and my boyfriend(16) were both virgins when we first tried to have sex,... well..., its a little embarrassing.., but , he was having some difficulties.. he couldn't get hard.., and we tried for a long time , and ended up just doing other pleasurable things..., well, we came to the conclusion , that maybe he was just nervous, or was rushing or just trying to hard..., so we decided that next time we'd try things differently, well... next time. ., and same outcomes..., this happened the next few times after then too when trying , well..., I always believed it was my fault , that I was just a turn off , and/or didn't do enough for him..., but he claims it's not my fault ..., well..., one day.., long story short , I ended up giving him head (first time but did pretty good apparently) and that got his dick up, and we actually did it..., but , now , I have to do that every time...., and I'm just scared that , he's gonna get bored of it, get tired of me having to do that everytime.., and I still feel as if there's something wrong with me..., we're both deeply in love either each other..., but have a lot going on in our lives,... we've discussed maybe its stress... but , I guess what I'm asking , is for anything..., just somebody , who's read this please tell me something to like help out , I'm willing to do anything for him..., so , someone , any advice ??