hi! I am a bisexual 13yr old who recently came out to my parents. They pulled the "You're too young" on me, and it has affected my happiness, temper, and productivity. Any advice?
Hey there! I'm sorry this answer is so late.
When I was 14, I came out to my mom about being bisexual and she said the same thing to me. I understand completely how hard it is when someone says this.
I know this isn't the perfect answer, but you might just need to weather it out. Instead of trying to convince them otherwise, start slow. I would drop mentions of being attracted to girls and nonbinary people as frequently as I commented on attraction to boys, say, if we were watching a movie and I liked one of the characters. If this is safe for you, you can try it.
You can also sit them down for a talk. Being frank and open is a good first step. Explain to them that even if they don't believe you, you want them to accept any choices you make (like dating or expressing bisexual attraction, or anything else you want to do). Tell them it's hurtful for them to say you're not bisexual, and you'd like them to keep that sort of thing to themselves. They might tell you they know they're right- In this case, you can ask them to treat you better even if you can't convince them. "Okay. If I'm still figuring myself out, then I'd like to do that without judgement."
But you shouldn't look for their approval. Try to surround yourself with people who respect your sexuality. It really helps to create a support system. Remember that what you're feeling is real, and even if it does end up being temporary, or if it's lifelong, the important part is that you get to express yourself comfortably *now*.
Sometimes people take a while to break down their preconceived notions of us. It sucks, but it's not your fault or your responsibility. I understand you want them to openly support you. You may have to start with tolerance, before working to acceptance. That's why a support system is so important. If you can't find other bisexual people or allies in real life, there's always the internet! Just be safe and remember you're not obligated to talk to anyone who makes you uncomfortable.
Eventually, my mom realized it wasn't a phase. Nowadays, years later, she's one of my biggest supporters. It was a slow process, where I went from coming out to her again and again, to asking for pride merch, to her even buying me bisexual flag-colored items because they reminded her of me! There is hope. I wish you all the best. Please continue to be authentically you!