Hi MsBunny - first let me say I had a brother now deceased who was gay, so I'm cool with gay people. I also answer questions in the Q&A section and we've had this exact question several times, but they were men worrying they were gay. I don't think you have gay tendencies and I think this is just 'intrusive thoughts'. I also read your 'about me' and see you have OCD, which explains why you're having these thoughts and shouldn't worry. If you were gay you would know it and not be worried about it. Now since you're young, sometimes people do change or realize new things about themselves and some even believe sexuality is plastic....meaning we might change at times in our lives.
In your case though, I really don't think you are and you're just worrying from the intrusive thought. Usually with intrusive thoughts, its something taboo to that person...for example incest, killing a family member when you have a hard time even killing a fly lol. I often use this example - if I have the intrusive thought of eating garbage...does this mean I want to really eat garbage - of course not, therefore the thought doesn't mean you actually intend to act on it. Try not to worry.