If you're going to want to show off your body at all, or be overly flirty or hint at sexual, Twitch won't work out for you. Better to only go there if you want to focus on a video game or specific hobby on IRL section. You can be a little fun and flirty there, but your audience is going to be really mixed with people who like it, kids who will troll you for it, and bitter people who will report you for it.
If you want to get flirty and show off, head to Chaturbate. As
@paige_orion said you'll need to be open to the idea that a large part of your audience could be gay men.