I have a problem .. my best friend, i'm not very commited?

My best friend Sarah always talks to any guy (HALF OF THEM SHE DOESNT EVEN KNOW AND SHE JUST FACEBOOK FRIENDS THEM CAUSE IVE TALKED ABOUT THEM TO HER) and she complains to them about how shes so ugly just so theyll telll her shes pretty, and then shell go up to me and be like guess who Im med last night and said i was pretty randomly when really when i talk to the guy they say that she randomly IMed them and they dont even know her.. so i like this guy mike alotttt and he likes me too so were kind of a thing. i like mike alot but i also kind of have a little thing for his best friend adam. ive known adam longer then ive known mike too. ive always thought adam was cute, and adam told me i was hott once. but i like mike but whenever im turnedd off about something from mike i kinda like adam. i mean i barely talk to adam tho becasue he would tell mike if i was flirting with him.. and adam is a HUGEEEEEEEEE player. but like behind mike's back adam has told me that he thinks im cool and hott and stuff.. anyways, sarah like IMed adam today and started talking to him meanwhile she says that he randomly IMed her of course, and he told me he thought sarah was cool. im jealous she has taken away every guy thats ever liked me. all my boyfriends broke up with me for sarah. i dont want her to take adam now, cause i kind of like him! and whenever me and mike end then she will like him i just know it she already told me hes realllllly hott. like seriously w t f.... idk what to do or say to her.. any ideas? i don't know if i can take this any longer.(he thinks shes cool too)