Well you can't let women control what you do. Some women will think you are a creep, others will like being talked to since they like the social aspect of it.
So you just talk to them and if you feel like they don't want to, you simply leave them alone. That's a fine behavior.
You can read a lot from body language as well. And if you talk to many women just for practice, it won't feel so strange or unusual to do it.