So, old title aside, you seem to be reacting pretty strongly to what people think of you. I can understand how frustrating it is when someone makes a wrong assumption about a core part of you... but people do that all the time for all sorts of things, not just sexuality: gender, likes, politics, blah blah blah. I can’t tell you to get used to it, or, dont let it bother you—because its darn difficult to do either or both of those. But people are still going to assume all sorts of things. If you actually want to say something, I think it’s a life skill to pleave it at “Nope, not me” “But but but I thought...” “ You thought wrong” [end of conversation right there].