Positions?

Ok so this is so embarrassing & I’ve had a really hard time bringing myself to post this. But I have to know if anyone else experiences this/is it normal?: I only like cowgirl or reverse cowgirl. Whenever I’m not on top, I get nothing out of it, and often tense up causing it to be painful. I am a sexual assault survivor, and I do get flashbacks, so this could be part of it. I am worried it’s abnormal. My boyfriend doesn’t mind because he likes me being on top. But still I sometimes wish I didnt feel such a need for control