I need advice in figuring myself out

Some background: I'm 19, in university, from Spain, but I still live with my parents, in a rural area, 2 hours away from Barcelona. I've never been into girls. I discovered that I might be gay at 13, I was a really naive kid, in fact realized it wasn't normal to jerk off to guys after doing it for some days. This wasn't "proof" enough for me, so I kept silent, despite the fact that I feel things for guys that I'm yet to feel for women.I didn't want to flirt with women, but I was scared of flirting with guys and finding out that, after all, I'm not gay. So here I am, 19 and 0 experience with any gender, no kisses, no nothing.So after all, I've realized that it's almost certain that I'm gay, (I've got off by just fingering, and 99.9% of the porn I've ever watched it's only with men). And I came to the conclusion that if people accept me as gay, they won't have any problem to accept me as straight, and if people don't accept me, they aren't worth me.So I decided to came out, I'm out to my mum, 2 girl friends from HS, 2 guy friends from university, and the president of the GSA of my university. So far everyone it's been supportive!I'm thinking of making the last first step and get on grindr and hook up, so I can finally be sure about myself. Should I? A big problem it's that there's a guy that I know from HS 12km away from me who it's also on Grindr, and it would be a bit awkward if he finds mr there, especially before I figured out all of this.Also I want to start with something like a bw, what I should say in my profile? "I'm trying to discover myself, anybody interested in helping me?" and then say that I'm only into bw in the chat? Can I leve a black pic and only share face in the chat, or it will be like mandatory to send nudes? Is it a better idea to go on tinder, put that I'm bi, and try to get a bf/dates and experiment with him, with the risk of disappointing him if at the end of the day I don't like guys?