
I think OP is more genderfluid than a trans man since they say feeling feminine or masc feels suffocating either way. They just dont know what they feel about gender identity yet. But to your specific question i woukd say patriarchy. Cis gender roles apply to trans folks so trans men might feel like a girl when they’re called out for it hence trying to fit in and present feminine while seeing themselves as a man so it feels like theyre dressing like a woman while being a man
Though i dont doubt trans women have dysphoria too every experience is very different but as for trans men i can tell you that mostly its cause of the patriarchy. Cis men also dont like us much because they dont want to be associated with anything feminine and most only see sex. Ik cis women are typically nicer about it and more welcoming