First Boyfriend

So I’m 14 and going into High School, and I recently just got my very first boyfriend. I have a older brother who’s 16 and has a baby so I’m scared that if I tell my mom she will freak out. I have no interest in having sex or anything before marriage or before I’m at least a legal adult but I’m still scared she will think I want to do something and make me end it. Any suggestions or advice?

P.S I’m already on birth control but not for any sexual reasons, I had a very irregular and heavy period and seeing as how PCOS runs in my family my mom wanted to make sure it wasn’t anything serious and she took me to the doctors and birth control was the best option.

(Idk if I still remain anonymous when I reply?)