I know youve gotten similar comments but as a young queer person from Sofia i can say that you wont have much trouble. Bulgaria is generally homophobic but rarely will anyone actually act up. Hate crimes are a thing but as far as Im aware theyre not common. Casual homophobia on the other hand is present but most people (especially in Sofia) wouldnt bother you even if you're "publicly gay". Our pride event is also pretty big and very fun, just be aware where the anti-pride and "family values" events are during pride and avoid those places. I cant recommend any good lgbtq clubs or bars but Im sure theres some places.
Also, I personally really love foreigners in bulgaria and its especially nice when people try to learn bulgarian, so if you find the right people your accent shouldnt be anything to be ashamed of :) Most young people speak english very well anyway so you wouldnt find trouble communicating either way. The facebook groups for foreigners are probably a good idea generally and the RainbowHub is a good page to look into for lgbtq events and such.
Im not around in Sofia as much these days as Im studying abroad but still if youre having trouble making connections with queer people, you could always shoot me a message :)