Am I doing something wrong ?

Soo every time I’ve had sex I was pretty much used to get a nut (🙄 ik sad as hell) but i never really did anything in sex just lay there (lame af) The guys weren’t ever like let me please you or let me teach you how you can please me without him doing all the work. Soo anyways now I have this serious bf and he actually gets me off and pleases me and he tells me things I could do to him if I feel comfortable doing to him and one of the things is he wants me to ride him but every time I get on him and wanna start “riding” him it hurts me like just me being on top hurts. I don’t know if it cause I don’t know how to move with him in me Or I’m not positioned right or something like that. he does say it feels good and that I just do whatever feels good to me that me just being on him feels good but since he says that I don’t know what to do since it hurts me. Any advice