Well it could be a few things.
First of all, are you out at school? Do people know that your FTM? Or do people at school think you are completely male?
It could be that they are interested in your transition if they know. If they don't know, then maybe they are attracted to you(they may even be attracted to you if they DO know. A lot of girls don't really mind, I've come to find. Straight girls that are generally open minded about things are all up for dating an FTM)? Or perhaps they want to be your friend lol.
My guess though, that they are probably somewhat attracted to you