The only way to find out what his thoughts, feelings, and motivations are is to ask him. I can't begin to read his mind. I can make some guesses, but these guesses will need to be confirmed by him.
Let's assume that you are reading him correctly and that he is trying to impress you. Can you see that you are painting yourself into a very dark corner by faking orgasms?
If he truly believes that you are orgasming as much as you pretend to be, then he will believe that he needs to hold up his end to keep you satisfied! It is entirely possible that he is inflicting a terminal friction burn on you because that's what he thinks you want. Meanwhile, you sound like you'd be happy to spare yourself the vaginal rug burn.
The only way to resolve this issue is to TALK to each other. If he truly has a huge sex drive, which many young men do, then that doesn't mean that your drive need match his.
Most couples don't have identical sex drives. He may be greatly relieved to know that your drive isn't so huge, which will give him a chance to rest and put some chapstick on his you know what!
All jokes aside. You both need to be honest and understand where you both are coming from (no pun intended). If he is going into overdrive to satisfy what he considers your insatiable sex drive, or if he is trying to make up for the time you are apart, that needs to be admitted.
If he does have a huge sex drive and you don't, then that needs to be discussed and accommodated. This relationship can't move forward with all the faking and lack of disclosure (and I don't mean 'disclothesure').