enthusiastic consent

Should I feel guilty (for being afraid to say no)?

Anonymous asks:
So im 17 years old and have been dating my boyfriend (he's 18) for just over a year and a half. I will admit we have sex very regularly, about 10 times a week, but the problem is, i dont know how to say no to sex! During our relationship, ive only EVER said no to sex ONCE! And he got so angry and upset about it....