You are a 15-year-old male and like to wear female underwear at home does this mean you are gay?

No, this does not mean you are gay! plenty of men like to wear womens clothes but have no physical or mental attraction to the same sex. Also a large section of drag queens (men dressed as women) are not gay and have normal lives and relationships. If you are not sexually attracted to men then you are not gay. This is quite common among teenagers and adults alike. Most of the boy's who talk about this say it is because they like the feel and comfort of the female underwear. They do not have any other reason to be wearing it. It is worth noting that females wear male underwear for the same reasons. Even if you were wearing womens clothes for sexual satisfaction then you would not necessarily be gay either. Many men like dressing in female clothes at home but lead absolutely normal lives aside from this. You are gay if you are sexually attracted to the same sex as yourself.