Since you watch Kuroko's basketball I'll give you advice.
You shouldn't fall in love with anyone, falling results in getting hurt. Love is something that blossoms and grows, this isn't a twilight movie, your letting your hormones get the best of you. You like her that's cool, but don't get carried away. The fact is in the details, you don't know what love is. You've been away from her for 3 days and your already questioning yourself and you really didn't even spend that much time with her to begin with.
Just take it slow man, spend more time with her and you'll learn to love.