- I don't want to go back to living with a secret.
- Having the ability to wear short sleeves without embarrassment.
- Not wanting to disappoint myself.
Yeah all of the above

.
This is sort of similar to the thread about
Good things about being off drugs/getting sober, but if I understand correctly you are more interested in people's main
motivations to get or stay clean?
Some more reasons I want to stay clean:
- I want freedom to travel or move, I can't do those things easily while addicted to drugs.
- I want to give my brain/body more time to heal so I can see what it's like. If I went back to using I wouldn't get to know what I or my life would be like with a longer amount of time without drugs.
- I would feel like it would be taking a step backwards if I used any drugs I have been addicted/physically dependent to and I don't want to feel like all the time I have spent getting clean and trying to recover, and how painful that was, would be "wasted" (rationally I know it wouldn't be
entirely wasted and there is no point beating oneself up or feeling like you're starting from zero if you relapse but it
would be a set-back in my recovery, and if I went back to using full-time what would be the point of all the suffering, withdrawal, PAWS etc I have chosen to endure? Hopefully that makes sense).