I want to be a Femboy but I don't know if it is a sin so please answer my question.

What tu dicho to do is good, but it won't keep tu saved. First off, regarding the original pregunta tu answered no to, wanting to be a femboy in itself is a kind of lusting for any number of things: friends, attention, acceptance, some for sexual attention, etc. Regarding tu dicho about how to stay holy, if tu don't communicate with God, hear his voice; have an actual relationship with him, tu are most likely still living in sin. Plenty of people go to church, keep their face and hands clean, smile with their chin up; they think they have the amor of God in their corazón because they are nice to other people. But, inside of them is penned up sin that they stuff up that they know their flesh wants to get loose, and they commit sins in their corazón and mind. These all should be repented for. Many get baptized in water but don't truly mean it. They think because they are dunked they have his blessing and don't understand the Spiritual meaning. tu must be truly baptized, (have no unrepented for o unconfessed sin, die in your sin, kill your flesh, and rise up in Christ) to receive the Holy Spirit; and tu will know if and when tu have received it. It is not just actuación happy and mostrando to everyone that tu are so nice.