I know it must be a confusing time for you. Obviously, it's impossible for anyone here to tell you if you're a lesbian or not, that's something that you have to work out for yourself. And there's probably no easy answer, other than to be true to yourself and never be ashamed of who you are. You're still quite young, so there's no massive rush to have to label yourself now. You need to spend some time thinking about how you're feeling, and as best you can, try and work out who you're actually attracted to. Is it boys or is it girls? And then, you will have a better idea.
Some people find they're attracted to both, which is fine. I know you wish you could maybe press a button and you're told which one you are, but it can't happen that way. You have to work through your emotions and then come to a sort of decision based on how you feel. You might get it wrong. And you might date someone, and it doesn't work out. But that's ok. Life is about making the best judgement you can, and if you get it wrong, you change your path, and get out there again.
I notice you're not a member here, it would be an idea for you to join up, as there are many members who would be glad to talk and listen, and maybe by talking through your feelings and explaining what you're thinking, they can help you decide or throw a few idea's or opinions in to help. It's free to join here, so it's worth a go.
Just don't rush any decision, take your time and I'm sure eventually, it will be clear who you're attracted to, and how you can go about establishing yourself. I wish you all the best of luck, and remember, it's always helpful to talk