There are so many people out there who make assumptions about their sexuality because it's what they've always been told by their parents and society, and they always feel unfulfilled but never really let themselves think about why.
You're not one of those people - by thinking about it you're taking the first steps towards a better understanding of yourself. It's great! You're brave to be thinking about it even this much!
You might well just be straight. I don't watch porn but apparently it's surprisingly common for straight people to enjoy gay porn. But anyway, even if you are straight you'll feel better having explored all possibilities and figured that out properly, rather than just accepting what you've been told.
The poster above has said it extremely well. There's no pressure, no rush, no shame, and no wrong answers. You're a legitimate person no matter what.