To me, furry is just another form of self-expression through the medium of animals. Do what you love.
If your friends detest or disown you for being furry, they don't sound like they're being very good friends to me. If I were in your shoes, perhaps a course of asserting your own view on the fandom and justifying your beliefs? or just get different friends :p
As for your indecisiveness, don't worry. We all feel that inability to make up our minds on occasion, though not always in the same context. The best advice I can give you is to do what you feel is right and make up your own mind.
Also, I couldn't help but notice the pic in your signature. It is very sublime. I like it!