A little advice please..

I feel bad and embarrassed to speak of this but I don’t really have someone to talk to about this. Me and SO have been together for 2yrs and just this summer I finally felt ready to have intercourse. Everything has been really nice but lately I noticed that I am really getting uncomfortable being intimate with him. I feel disgusted after doing it and I feel as though he has no idea how to treat me while doing it. He is rough sometimes which I think should be fine but to me it is not. I don’t know how to tell him or talk about the situation with him because I don’t want to hurt his feelings but I just really dislike doing it with him now and I feel really bad and embarrassed about it. I don’t know what to do anymore and because of that is the reason why I try not to be intimate with him as much. Please I am just looking for advice!