Why do people wear underwear?

Im a 25, female, I stop wearing underwear at age 15, and will never wear one again. Whats the point of it?

Why do girls and guys wear underwear
Update: i'm getting alot of answer from women bout period, discharge body fluid ect, im not understanding why underwear is a easy solution for that instead of cleaning are lady part often? why aren't we in diapers then?
Update 2: this question made me realize how people really dont have high hygiene, clean u vag ladies dont use ur panties to do the job
Update 3: would like to give some detail about my lady part, maybe this would be advice for other ladies, i do not have any pubic hair i wax all of it i shower twice a day, i keep it clean when its my time of month i wear tampons i dont have a roast beef vagina so nothing hangs out when i wear dress/skirt when i do wear... show more would like to give some detail about my lady part, maybe this would be advice for other ladies,
i do not have any pubic hair i wax all of it
i shower twice a day, i keep it clean
when its my time of month i wear tampons
i dont have a roast beef vagina so nothing hangs out when i wear dress/skirt
when i do wear dress/skirt i make sure to keep my legs closed
i have never got a infection
occasionally i get camel toe, but who cares
i am not a porn star or stripper, im just a girl who hates undies
Update 4: men stop wearing undies we want to see that bulge
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