I'm not ready for sex..?

My boyfriend and I have been dating for 2 month now and he says that he's ready for sex. I'm kind of nervous because I'm 15 and he's 17 but I want to make him happy. I really love him and I'm pretty sure he loves me too but I still get really scared when he gets in the mood and I'm not because he gets really upset when I say not yet. I already give him handjobs and blowjobs but he says its not as good as sex. I just want to make us both happy but I don't know how.