How did HIV started,if u cant creat it by ur self and u need some one to be effected,then how did it start???

I asked last month if someone can get him self affected by HIV, so the answere were no you cant creat or make it by ur own body, you must take it from someone else by having with already effected body, or using needles and all these things, i know so much about AIDS, but what i do not know and i couldnot find through internet is that how did it start, i read it was found on three men who were gays thats why they first said its for gays, but after that they knew its for every one,men women babies, but what i wonder who was the first one to get effected and how !!!!?? did he get HIV from bad ual behaviour?? by blood ?? labs experiements?? i have been thinking about this for months?? if it was created...then i can created it by my self,,if not...how did it start!!!!!!!!!!!!!!!!!!!