Welcome! I just did the same thing today as well. I was searching weight loss forums on google and this was the only one that really appealed to me - and was still alive.
I had the same thing happen to me. After 18 it just slowly started piling on and over the past year I've noticed it happening more quickly. Although I know it's not too bad yet.. I would rather stop the gain in its tracks than continue to get heavier when I'm older.
Good luck! You sound like you have a pretty good mindset already