Here’s my story.
Sometime in April a guy who was a friend of a friend started touching me, yes I know I should have not let this happen but I found him kinda hot so I let him touch me. Started questioning when I got home. I then developed a slight crush on him but got over it after a few weeks.
I should have handled the situation differently but it caused me to learn about myself.
I think it was gradual for me. /r/bisexual on Reddit helped me a lot actually. I’m a male (genderqueer technically) and I am like 90% attracted to women (or people presenting as women), but there were always guys that made me stop and go “oh dear is it hot in here” if you know what I mean. However I never felt like I “qualified” for calling myself bisexual because I have never had sex with a guy or I didn’t like guys “enough”. The folks at /r/bisexual helped me realize “Nope, still bi, have fun!”. Hot people are hot, that’s all that matters.
(On the note of bi/pan, I feel like bi encompasses everything that pan does. HOWEVER bi colors > pan colors :) )