Cant feel anything?

Recently started dating my boyfriend, everything is great but when it comes to sex, im pretty new to it. When he goes down on me, i cant really feel anything? And when he fingers me it feels good, but i cant orgasm, and after awhile it starts to hurt which ruins the feeling. Sex is the same way, i cant feel anything or it just hurts. Im not sure what im doing wrong, maybe its cuz im not fully comfortable yet?