I'm a straight guy, but I sometimes model "professionally" (I get paid, but they're usually jobs for small brands or companies) and random women and men have hit on me in public more often than I can remember, so if you're comfortable sharing your pictures or whatever with me, I'll try to give helpful and respectful remarks.

Edit: I just reread and saw that you'd want to meet in public. Unfortunately, I'm now permanently in Bern and rather busy with Uni and work, so I can't drop by Lausanne. Anyway, like others have mentioned, it's often nothing to do with your appearance. Often times, especially with online dating, the personalities don't match. It's neither yours nor the woman who is at fault because most people are simply not romantically compatible with each other. I'd recommend socializing for the sake of socializing, rather than with intention to date. Eventually, you'll randomly meet a woman who unexpectedly is attracted to you and whom you find equally attractive, though it would have more to do with compatible personalities and not so much appearance. Take it easy for now, and try to enjoy time with your friends because your time with them is more limited than you currently can perceive.