Confused about sexuality

I think I’m straight but I’m not very sure about it.

I am definitely attracted to guys and I can see myself in a relationship with one.

I think I’m slightly attracted to girls but I cannot see my self in any kind relationship with a girl.

When I see pictures of girls my eyes wander to their breasts. But when I think about having sex with a girl I feel a little grossed out, and it’s not because I’m homophobic or anything, it’s just cause I can’t see myself ever enjoying it.