I used to feel desperate for support, feedback, help… Actually, I didn't know what it was that I craved, only that what I kept doing was seek out ways to tell someone about my attractions. I'd say online is the best place to go, to balance out safety with the support you can get. Don't use imageboards, they suck. Any sort of public space gives you low odds for support; you should rather come out to someone you know well, one on one. If you're honest and not a total ass, most good people will understand at least to some degree.
Honestly though, you're not going to gain anything of actual use from talking to people. If you're just feeling lonely; give it time, be patient. Get yourself out in the world and do things and be patient. You don't need to do anything specific, just be involved with something and have patience.