Sexuality?

Lately I've been wondering if I'm not 100% straight. I've been noticing that I find a lot of girls attractive and thinking back to when I was younger I would have thoughts like "what would happen if I kissed my friend?" And then be like "that's weird, why did I think that??" But I've only ever dated men and I'm married to my high school sweetheart (who I absolutely love and would never in a million years leave). But then I don't think I'm comfortable calling myself straight...on surveys that ask about sexuality labels i just skip the question or mark that i don't want to answer.

So I'm just not sure what my sexuality is or if i should even bother trying to find out since I'm 100% happy with my husband. Is anyone else in the same boat??