Dating guys

So I'm 12 years old and I have a boyfriend. My perants don't now I'm dating him. I was giving my mom a hint about dating him and stuff and people at school dating. But she is like no way . u are not dating anyone. It gets so anoying and I can only say that we are friends if we are hanging out. I am pretty mature for my age and I think my mom thinks I am not. Any suggestions on how to convenience her to let me date. Plz answer ASAP.