My girl’s been having this exact issue with dudes 😭😭 you pretty much just have to signal. Get a lesbian bracelet or pin, something subtle like that. Carabiners also work (and they’re practical, that’s why we love them). Don’t be afraid to be passively flirtatious either, some of us are dense 😭 look in the general direction of a pretty girl and wave when she looks near you, starting that first interaction is half the battle 🫡🫡