Make small talk.
I personally hate it when I’m told a chat up line straight away I would rather have a basic conversation and go from there if I wanted to.
Practice starting conversations. Not just with women you find attractive. Just generally with anybody. Once you stop being in the mindset of “I’m single Mc single son” it’ll make such a difference. Your conversations will be more natural — less likely to set off alarm bells.
As others have pointed out, different women prefer different approaches. To specifically address creepiness, though, here’s my two cents.
Be physically non-threatening. Every woman is aware of the possibility of being stalked and murdered just going about her daily life. Are you a fun guy just trying to start a conversation, or the next Ted Bundy? We don’t know.
Never block a woman’s exit or escape route. For example, if she’s sitting down at a booth, don’t sit beside her and trap her against the wall. Sit across from her. If she’s sitting on a bench, don’t stand over her. Sit down if you can, but not close enough that you could grab her. Keep your hands out of your pockets. Smile.
If she tells you to go away, says any form of “no”, or just generally looks uncomfortable, give up. Don’t push it; you’ll only make it worse. Sometimes a “no” turns into a “yes” when they see that you take them seriously and start to leave. Sometimes not. Don’t take rejection personally; there could be any number of reasons why they aren’t interested in talking.
And as others have said, be yourself. It’s no good putting on a persona you don’t really have, just to attract someone you’re not really meant for.
just treat them like a person.
Approach them like a potential friend, not a potential girlfriend