Any advice from a professional

I’m 18, 6’3, 220 pounds. I have a few questions 1. Am I too fat🫩 2. What’s the most important things to study for on the asvab, 3. I had an incident when I was 13 got arrested and I was told it shouldn’t be on my record but I don’t know if they can still see it, I almost wanna just tell them cause it wasn’t

anything super serious it just sounds really bad, domestic terorism the whole story isn’t that bad it’s just what I was charged with that sounds super bad but I haven’t been in trouble in years so I mainly wanna know if it’ll get overlooked.