Hi im sorta worried see im a virgin and my boyfriend and i really want to have sex but i'm worried that his penis wont fit should i be worried?

I wouldn't: It is quite normal to worry about things for which you have no experience, but understand some basic facts. The male equipment is designed to fit the female equipment. There is a good deal of variability in the males and some with females.However, the female is able to pass the head of a newborn through the same tunnel, so I expect you will do fine.