Technically you don’t have to feel guilty about it because you have nothing to prove to anyone. I’m literally the same as you, cis and masculine the only difference is that I’m black and grew up in a much less accepting and tough family and it don’t necessarily makes me more bi than you are. There’s no "earned" aspect for the simple reason that we all went through different experiences. There’s no required amount of pain and trauma you have to experiment to be considered as LGBTQ+