Rn I'm doing me and focusing on myself but out of curiosity, when do you start to get noticed by girls?

I've always been invisible, almost literally. I'm not too tall so maybe that's part of it, and not being social.

I'm working on changing and improving myself and just wanted some insight

I get that girls won't approach you but when do they give out signals like eye contact, smile, etc?

Do you have to look like a male model or something?