Does anyone know how to change your on tiktok?

I have an account with almost 600 followers with isn't much but is something. A couple of days ago I was tryna go live but I didn't have any of the things they were telling to use so I just left, And then they put my age at 9 for some reason, and now only my friends and my followers can see my videos and I can't message anyone in my inbox. I'm also losing my streaks🥹