Yes, I get that feeling a lot. Being the youngest of my grade, it’s easy to get pegged as “immature”, not to mention the fact that i don’t have social media or safari, so I never know what’s “in”, AND my ADHD makes me seem hyper, overly optimistic and bouncy, therefore also making me seem younger. I have protective parents and I am not allowed to go to sleepovers or watch PG-13 movies. Sometimes I end up feeling like an immature baby, but then I realize that this is just who I am and if my friends don’t like it then they don’t like me, and you don’t have to cut them out of your life entirely, just maybe try finding some new people and pushing the negative people off to the side.