does you bf know you feel uncomfortable about this? if not i think you should talk to him about what makes you uncomfortable and such. i know this is easy to say, but hard to do... but for a relationship to work best for the both of you, especially one phyiscal you need to be able to communcate with him about these types of things.
if you're uncomfortable talking to him about it than you should try to have what you are going to say to him figured out beforehand... i had to do this with my exbf cause i was really uncomfortable with a certain action we were doing. it really bothered me, and i was worried to tell him because i wasnt sure how he would react to me asking him to stop asking if we could do it. i was really nervous talking about it, but i finally did. and i had been nervous about nothing. he was completely understanding, and he stopped asking to perform the certain action. i told him when i felt i was ready or when i wanted him to do it i would let him kno. we went at a pace that was good for both of us.
mayb if you just straight out told him you arent ready to be "in control" he would stop asking so much. than when you feel more comfortable or ready, you can just surprise him.
also, you sound really like your really selfconscience... even though hes older it doesnt mean that he knows everything about everything. just experiment, and even if ur knew to things he wont notice. its really hard to tell when people are new to things, unless they straight out say it. experiment with things at your own pace.
among everything, just do what you feel comfortable doing.
dont worrie b happie... its like a law! =)
hunt for clothes NOT for animals. =)