Hi there,
I was just kind of messing around with myself, not really seriously, and after a few seconds it felt like I really had to pee and I got kind of wet/tense. Nothing else really happened, I just stopped messing around, but did I have an orgasm? What do you think?
I really hope that wasn't my first because that'd be really lame :/

I'm assuming you are a female and the answer is, yes, possibly. The Earth doesn't move every time (so to speak).

Yes I am female. Is there any way it wasn't? I know it's weird but I really really don't want that to be my first. So, maybe I just got close?

Maybe or maybe not. Are you saying you don't want your first orgasm to be during masturbation?

Yeah, that's the main reason. Plus I feel really really guilty.