How do you know your first love?

This is one of those cases where explaining something so simple can be so complicated.

You know when someone is right for you when all you can think about is them. Throughout the entire day, you find yourself thinking about them. To add to that, you may feel a bit shy around them despite "liking" this person. Its a case of wanting to talk to the person, but being scared of saying the wrong thing.

I cannot give you a definite answer, but I can assure you, if you truly love this person, you will know, as there wont be a doubt in your mind.

Hope I helped.