I am 32M and am now just discovering I am polyamorous.

Every time I have a GF, I can't help but to wonder that the grass is greener on the other side, fantasizing about other women, thinking they are much more attractive than my GF, etc. After all, I don't have one specific type; I am attracted to tall, short, white, black, blonde, brunette, thick, skinny, etc. It makes it extremely difficult for me to focus on just one woman; I find a vast majority of them attractive. I don't think monogamy is for me; I always lose motivation and the relationship ends after 6 months maximum.