Meet people through classes ,gym and tinder.

Tinder i have no problem setting dates/going out and such, but around campus i usually mind my business, workout and go to class.

I get some attention here and there from women in my circle, but it seems like I fuck it up most of the time whenever i reciprocate back that i'm interested in them?

Some examples

No.1 : Chick in my math class, looking my way smiling a lot during lecture/after class, asked me to study with her sometime. Actually took her up on it & escalated a little. No longer interested

No.2 : Chick in the gym, I'm doing my own thing and notice her giggling with her friends as i swing by for water frequently, smile a bit and keep moving, later get her number around her friends(maybe bad move?). No interest after about 2 days

same with all shit behavior, i just cut contact/attention and go back to my own thing

few more examples, but maybe someone here can increase my socially awkward ass's turnout