Whether your boyfriend is black, white, orange or yellow, men come in all sizes...However, I would suggest that you watch what is happening...If he is too big for you and you tear, this would require surgical repair...This is not a nice surgery and seldom heals the way you would hope...I know of this happening with a woman and it can be serious...
If he is too large, tell him not to enter you all the way...Get some relief...Lube may help but there is only so much give inside your vagina to accomodate a man sexually...If he cares for you deeply, he will understand...It kind of comes down to your body or his....
Just my thoughts....
Caroline