I’m so sorry your family is making you feel this way, Anon. It is okay to like childish things. People with and without disabilities, Autistics and non-autistics, often like a mixture of things that includes things that might be a bit childish. Sometimes this is to different extents, but that is okay. What’s not okay is that your family is treating you this way.

You still liking things from your childhood, or liking things aimed at kids, doesn’t make you any less of an adult. It doesn’t mean you deserve to be treated poorly. It means you are a human who has your own likes, wants, and preferences. As long as you are not harming anyone, it is okay to like the things you like. You are the one who decides if you like something, not your family and their ideas. 

I hope you find a way to get into a space where you can engage with the things you enjoy without your family making you feel bad or trying to ban you from liking it. It is okay to like childish things.

As for your friends, explain to them that you aren’t okay with how they treat your interests. It’s okay that they don’t like the same things, but it’s not okay if they are making you feel bad about that. This can be difficult or scary, but it is important to communicate to your friends if they are doing something that hurts you.

 If you tell them that it is making you feel badly that they are saying these things to you and they don’t respect that, then you need to ask yourself if they are your friends. Friends need to respect each other and support each other. Friends shouldn’t make each other feel bad on purpose. It can be really hard to deal with growing apart if you have been friends for a long time. It can also be difficult to make the decision that someone is not your friend if you have been treating them as such. 

Best of luck, anon.