I’m confused!!

Okay so like I’m actually pretty young I’m not gonna lie, I’m about to turn 15 in a couple months but I’m not sure if I’m bi or not🙃 in 7th grade I decided that I was bi (for sure!!) and I told my parents and siblings and well they were all supportive except for my mom, she yelled at me and said that it was just a phase so I just cried the whole car ride home and we didn’t talk about it after that. Then 8th grade came and I decided I was straight (I think the reason why I thought that I was straight was because I was embarrassed tbh). I had just started a new school with a bunch of different people who weren’t as accepting as the people in my last school so I just told everyone I was straight. Now I’m in 9th grade and I think I might actually be bi.. I have this friend and honestly her and i flirt back and forward (i think she lowkey likes me) and well tbh I don’t like her but... she gets me “aroused” lmao 😂 and well idk.. but I mean I have a boyfriend and I’ve done things with him and I know I like boys FOR SUREEEEE!!! But I’m not sure if I liked girls:/ i’ve never kissed a girl before or anything like that so idk.. any advice??