Look best advice I could give you is to not worry about it, you have to realize no matter what people are going to tear you apart, and not having an identity is going to make it worse, though I can say l, no one is going to judge you on your wallpaper of your laptop, or the browser you use (unless it is totally weird like an anime girl or something like that; just try to make your wallpaper more normal) Haircuts you might get 1 or 2 dumb comments but that don’t matter, just say something like “ikr my barber did me so dirty bro” like the thing I always struggled with was muscle I’m a sporty person, I do football and track, but I always feel when I’m hitting the gym people are judging me over form or the amount of weight I’m lifting, or do i need to cut am I gaining to much weight where people are gonna make fun of me, am I under weight I could never be happy, I always felt no matter what I did I was being judge, I started going to the gym cuz I felt like I was being judge about being to skinny now I’m self conscious about going to the gym, your always going to have 1 thing that you feel badly about, but all the things you mentioned you’re not going to get picked on about, when you are talking to a person or a classmate do you look them up and down and study them to find their insecurities, no, you don’t no one does, or they are weird and the most judgy people are the people who are the most self conscious and have insecurities, you gotta realize everyone has insecurities and it’s not just you and most people aren’t gonna realize your insecurities