I WANT TO BE ABLE TO SAY NO WITHOUT THE FEELING OF GUILT.

I always feel I can’t say no even when I was a child… I could not just say the word no… I thought it was rude too… I was always giving other people my things, taken advantage of, doing others things for them, give my self up -> sex because I could not say no… etc. I feel guilty or mean when i say no to someone I can’t say it to my boyfriend either and when i do i feel so bad i can cry about it, a few times I had sex with him even though I wasent feeling well i didnt want to say no. He can take a no he has told me to go ahead but i can’t. I say yes to things knowing I wont be able to do.