Congrats. Along the same lines, I was a fat teenager, and I credit "growing up" with taking care of my weight (& health & fitness).  When I say growing up, I mean taking responsibility for your decisions and outcomes. Stuff like "*people come in different sizes" applies to height, and to some extent propensity to build muscle, etc. But applying that to fatness - it's childish. The "adult" way is to say to yourself "I am this way because of ___, and I'm going to do ___ to change it*". And that's how I grew up. Amazing what taking responsibility for your own decisions can do for you and what "owning the results" can do for you.