I know i'm straight but can't stop being paranoid i'm les?

[Taylor-Rose]

I'm a teen girl and i'm straight, but i'm paranoid that i'm lesbian/bi.. I know i'm not because i'm not attracted to girls but my mind keeps making me think i'm not straight. It's really annoying.

I think i have a paranoid personality as i get worried very easily and paranoid about many things.
Like for example:I listen to a song that is sung by a gay man (Joe McElderry) then for some reason i think i'm les/bi.

I looked into Joe McElderry's story about how he realized he was gay; he said when someone wrote on his twitter when they hacked in that he has been living a lie for many years. So now when i joke around with my friends and say we call someone gay; i always think of him, then in think that i'm les too.

What can i do to persuade my mind i'm straight?? Because i'm worrying for no reason.

Please Help; thanks :)xx