Yes, of course you are normal! Usually, when we find that we become obsessed with something, it is for a very personal learning experience. Obviously, there is something about River that calls to you in a very basic way that your mind is trying to process. He had some amazing attributes! Maybe his loyalty and responsibility to his family? His dedication to his profession? His lust for music? His depth and maturity? His passion for his causes? Maybe it was his physical beauty? Any of these qualities can be overwhelming and cause great feeling. Or it could be the combination of the raw beauty and talent combined with the tragic death that makes him so mesmerizing?
Whatever it is, try to find what the pull is for you and use it as a meaningful catalyst in your life. It will help you to quench your thirst and let his beautifully short life have an inspired meaning in yours. I did and I have a shirt that I wear on days that I want to remember what I feel like I learned from him!