Sexuality/gender

Hello, how do you know you're trans? Like idk if I am (non binary? ). I don't even understand the difference between bi and pan, so I reeeally don't know 'what' am I. (I don't have any problem with my body, 'cause I'm not that feminine, and I don't have much boobs or hip and I don't care about my phisical appearance except my clothes. I 'm jealous of male fashion/body too ? that I like more than female's) sorry if I said anything offensive pls if you can tell me your story even if you just doubted. Internet isn't really helpful too more confusing than anything lol