Is it legal for me and my girlfriend?

My girlfriend and I are sopre in high school. I've been with her for 7 years and I want to start making love with her. We're both madly in love with each other. She's getting really depressed that I don't want to make love with her. I want to show her how I feel about her and show her how special she is to me. I love and care abut her so so much. I want to make love with her but is it legal for 2 underaged persons to engage in ?