Why isn’t as pleasurable for me as him ?!?

So me an my bf just started getting intimate an ive noticed that sex hurts/ uncomfortable more than it feels good compared to his oral or etc an I mean I haven’t told him that really an I just fake it feeling good while I’m in discomfort an I just wanted to know any thoughts abt the situation or tips to possibly make it more pleasurable for me as for him ( I’ve noticed it feels a lil better in the doggy style position)