Being gay is really a choice.

My bestfriend came out as gay when she was 16 and dated exclusively women until she was 23. Now she's straight and doesn't consider past relationships with women genuine. Also during those 7 years of being gay she never considered the possibility of being bisexual - she said she loved women.
Now I have another friend who's 25 and just came out of the closet, but always dated men and said she chose to be gay because men are shit.
Anyway I have nothing against gays and my friends and I still hang out but it's all confusing. I thought people were born gay.....