Not really. I had a moment of realisation when I fell in love with a girl that I was a lesbian and everything just made sense, I only ever "liked" boys in school because all my friends did so it seemed like a typical teenage thing to do. A few years ago, I did have a month or so when I was questioning if I could be with a guy, because I've always identified as lesbian, which was strangely upsetting at times but I think it was just a passing thought that I worried too much about. I haven't questioned it since.