Am I in love? I've never fealt this way before.?

I have known this girl for a year now. And we have been talking on the phone almost every night since September. And I met her at school. We just started dating her 2 days ago. And when I'm with her I feel weightless, boundless, I want to make her feel so beautiful, she makes me feel so good, I think she is beautiful inside and out. I would do anything for her. And I have had to stand up to my friends because they don't like her, I have stood up to my father because he wants me to date my ex, and I have had to fight my brother to date this girl. I told her how I feel, and she tells me she feels the same way. I am asking this because we are both unsure of love, we have never felt it. And the two of us are leading into a ual relationship. And I want to know that I love her the first time we make love. I have never felt like this. And I don't want to be in a lustful relationship. Thank you.