You're not the only one. I thought I was the only one, then found this website and book,
Renaissance Soul Life Design. Try the little quiz on the side, and if you answer most of them yes like I did, you'll know that all along you haven't been by yourself. And trust me, there is nothing wrong with you. I thought there was something wrong with me for having too many interests (sports, travel, history, nutrition, etc.), but now realize that there is nothing wrong at all.
It's actually a great quality to have in my opinion. I can just never see myself doing ONE thing for the rest of my life, just because that's what most people expect you to do. There's too many great things in life to only try and love just one. I just ordered that book, so I look forward to reading it.