Could I be bipolar?

My mother says I’m not,but the symptoms are all there. She says I’m just strange,and that it’s not possible for me to be bipolar because no one in our family is. But the thing is…I’m happy,hyper,and full of sunshine,and rainbows one hour,then I’m all “Please,just kill me!”,and all depressed,and tired… When I’m all happy and hyper I’m always super positive,and I love everything.I give hugs to all my friends,and I always smile,and cracking jokes,and saying “I love you’s!” And I talk really fast,and walk really fast,and I can’t stop jumping from one subject to another. When I’m hyper My friends always ask “What’d you smoke this morning?” and I’d laugh,and shout,”I’M JUST HIGH ON LIFE!WHOO!” I talk differently too. It’s all high pitched,fast,and giggly. Then in the next hour,I’ll be all,”Ugh…just some kill me…” I’m all tired,and wrried,and pissed off at everyone…and I’m paranoid. I naturally have low self esteem…I’m always irritable though, 24/7. But I’ve learned to hide some of it. I taught myself some thinking techniques to help me…like just saying to myself to let it go,and not get so upset I would want to hurt anyone. I yell at my mother so much,and I feel terrible afterwards…since she’s going through a lot…and I feel I have no right to yell at her. But I do,and it makes me feel like I’m a point of suffering to her. Like I’m a bad seed. I enjoy being alone.I can’t stop my brain from thinking,and I have trouble sleeping. At sleepovers,instead of going to sleep like everyone else…I watch them sleep. It’s creepy I know. But I don’t know what else to do! So I hover over them,and watch them. I’m paranoid,and extreme mood swings. Happy one min. Depressed the next. Sometimes,I can’t even feel emotion at all! It’s making me insane.I can’t stop thinking about this. The symptoms are there,but my mom says I can’t be bipolar. Please help me…