I feel uncomfortable seeing gay people

It may be a bit weird, but I still have to ask. I consider myself bisexual (although I still have doubts about that). I have nothing against gay people, I support them - yet I feel weird when I see the people kissing, holding hands, proposing or sharing kind words with one another, yet it doesn't bother me when it's a heterosexual couple.It makes me feel bad, I feel as if my mind is subconsciously telling me that I shouldn't treat it as something normal. It is quite weird for me, given the fact that I used to be in a long distance relationship with a guy.So, I must ask - what should I do to not feel this way?