It's great that you've fallen in love in French. The same happened to me in high school, and I speak French to this day. Whether to major in it depends a lot on what you intend to do with it. I thought about majoring in French, then ended up minoring in it (along with International Relations). My eventual direction was pre-law, and I didn't want foreign language to be my primary focus, but the French minor has always been a talking point with prospective employers and has helped me get work involving French. I wouldn't worry that much about being behind if you do major in it - with your passion and your evident foreign language skills, you should be able to get up to speed before too long. I suggest you take some more time to explore career choices, keeping in mind that even with a foreign language minor, you can still use that language as a qualification/selling point that can open doors for you. All the best - bonne chance!