"go up to a girl" - are you approaching while she's busy, hassled, clearly not in the mood to be approached? are you touching her? "talk to her" - are you forcing conversation when she seems uninterested and is trying to get away? are you asking about uncomfortable topics, or being suggestive in conversation? “get her number” - are you asking despite receiving signals of disinterest? not taking no for an answer? a yes to any of those questions is an example of how you could come off as creepy.
There’s one issue. And I’m not trying to be a smartass. I’m not gay. If a super intimidating guy much bigger than me even waved at me I’d be freaked. I don’t mean this in a smartass way. I literally mean I can’t put myself in a straight woman’s shoes of how it looks when I am not attracted to men.
it really doesn’t have much to do with attraction. you can be creeped out by a guy you’re physically attracted to, you can be perfectly comfortable during an interaction with a guy you’re not attracted to. if you would be freaked out by any interaction with a bigger guy how do you make friends lol