Picture a girl laying on the beach belly down with her bra off, catching some sun. Volley ball rolls by her, she stands up, picks it up, and throws it back into the field. Next thing, couple dozen balls are thrown at her from all the dudes on the beach. If girl don't block your lame advances, she'd be in trouble at the gym because there are eyes everywhere.
Truth is tho, there are different levels of man, there are average looking men, and there are spartan gods. If you had body of Jeff Cavaliere and alpha presence to match it, chances are she'd submit to her fate. But since you are average, she has no interest. That don't mean you can't get laid, you just have to approach properly. What you are doing is weird as fck. Next time you see guy on treadmill alone, go ahead and take treadmill right next to him, see his reaction.
To greatly reduce rejection, look for signals before you approach a girl.