Annoyed...

So I don’t feel comfortable telling my mom some stuff. And my dad would have a heart attack if I told him. Like when I help hands with my boyfriend for 2.3 seconds and one of my so called friends keeps on saying that if I don’t tell her stuff then she is going to tell my mom about that. I am tired of it and I don’t think that truthfully she is my friend but I am super scared to tell her that. She is just the kinda person who is a jerk like that. Her boyfriend and her argue all the time so I kinda think that she is jealous of me but I am freaking out. Help me please!!!!