Is my sister a ?

I'm 13 years old, and my sisters 22. She hangs out with alot of gays/s. My sister and I rnt that close. A few days ago she asked me if i knew wut gays and s were, which wuz kinda akward. She told me that 1 of her best friends wuz a . I dnt really care. I went snoopin threw her stuff 1 day and i saw a card from her friends saying "happy 2 months". I dnt care if my sisters a but i mean im her SISTER... and she always tries 2 keep secrets from me. I mean its not ilke im a 7 year old. HELP, and plz dnt say that i should ask her becuz as i said before we're not that close...