Congratulations!! You look great, and I know how big of an achievement this is.
I've SO often regretted not getting fit when I was younger. I'm only 32, I know, but I wish I hadn't been so overweight in high school and college. Partly for the clothes factor, but more so for the self-confidence that comes from knowing I've achieved something. When I see how excited you are and how far you've come, I'm honestly a litte jealous.
Oh, one more thing - this is the second post from you (I think) that has apologized for your arms. Can I just say, your arms don't look nearly as bad as you think they do? For real. And even if there's some loose skin, maybe think of that as a sign of how far you've come.
You look great!