HELP ME

my moods are SO BIPOLAR and i don’t know if that’s normal or if i actually have a mental problem. but sometimes i’m super happy and enjoying life. and then other times i get depressed as f*ck and i hate myself so much and i wouldn’t be surprised if i killed myself right then and there. and then there are some times where i get really really mad out of nowhere and i punch walls or anything to make me take out my anger out and feel pain. i used to self harm when i was 12 but i’m 16 now and i stopped doing that a long time ago. but sometimes i feel like doing it again but then theres another voice telling me not to. i also have a lot of insecurities and things causing me anger but i keep all of this bottled up and ignore it and it just builds up and there are times where i think of all my insecurities at once and i don’t know what to know or sometimes i think of everything that has made me angry and it makes me wanna do some really really bad stuff. idk if i need to get mental help or not but if you think it sounds like i do then let me know and how do i tell my mom to make me an appointment ? because i don’t think she takes me seriously