Also how do I tell him I want to go to the next step without being nervous?

I am 15 years old almost 16 and I have been dating my boyfriend who is 16 for almost 6 months now and things are getting pretty heayede, I can stop thinking about him and I'm turned just by the thought of him, I am thinking we should go to the next step oral sex, and we had planned on prom to go all...