1) Do things because you love them, not because it’s expected.
For me, this manifested a lot in wearing makeup. It also seemed like I would be liked more if I wore makeup. PSA: If someone only likes you because you started wearing makeup, they are not friends!
2) The sooner you create a personal hygiene routine, the better.
So, up until basically this year (sophomore year in college), I didn’t have a hygiene routine. Or really a routine at all, other than going on the computer. Routines do so much and have given my daily life structure. I do wish, however, that I’d started the process when I was about 13 or so. I wasn’t working, I didn’t have a ton of homework, and my bathroom at the time had a heater! (it is so much easier to take a shower at night with a heater in the bathroom).