if you want to know if your tricking yourself i recommend thinking about a future with his person. what feelings do you get. imagine living with them and almost always being around. do you want that?
also i think the feeling of love is when you see them and everytime you do you cant help but smile and become happier. and when you are with them you always wish you didnt have to leave. is this how you feel towards this girl?
basically if you realize that you love them find out if you want to be with them or keep it in a friendship. sometimes the relationship works better as a friendship even if you are in love. alot of it depends on the other persons feeling.
good luck with this. i hope it works out