Im gay... always liked men ever since i was young. are people born gay or is it something that their living environment causes?

The question you: raise is called the "nature nurture controversy." It is an old issue and comes up in many areas of health and psychology. Most research and opinions today point to sexual orientation as an inborn trait. There are other expressions such as folks in prison who temporarily express homosexual behavior but it is temporary and not true homosexuality. This confuses the research. the very best to you

Neither: Best evidence is that sexuality of most gay males is determined while they are still in the uterus. The likelihood of a woman's son being gay increases with each subsequent male child but only right handed males. The first son and all left handed males have a 2% chance of being gay. The third son if right handed is actually more likely to be gay than straight. https://youtu.be/RGnZgC47SLA?t=141