Hi Mia
I began losing weight when I was 24, too. I weighed 331 lbs at my highest known. I understand. Fully & truly.
I'm so happy that you've joined 3FC. You'll find an entire site full of women and men who understand where you're coming from.
Becoming healthy is a large resolution. It's simple, but it's a large task. You may benefit from breaking it down into the tiny steps it requires.
One of the biggest suggestions I would make may only benefit you further down the road, but you may want to keep it in mind.
We are all human, and we all make mistakes. Sometime in the future, you may find yourself faced with the fact that you ate something you didn't really want to, or you didn't make time to exercise. This is not failure. It does not end us. Nor does it mean the end to your resolution. Not if you don't let it. So, if it happens that a few months from now you find yourself faced with similar events... don't wait until the next year to start again. Instead, pick yourself up right then and there and continue your newer, better habits. Repeat as needed.
You can do this! Keep at it!