Im in love with this girl!?

I know for a fact i love her. I can't stop thinking about her and i like talking about her with my closest friends. She knows I like her because of instinct- I've never professed my love for her. The thing is that all my friends say that Im always there for them to listen and help them out and being a tall guy gives them the impresion that Im this big toughh guy when all along I feel that when I see this girl like I'm a big mess. I fall for her looks and well i fall more and more in love with her. Whats going on here?