Hey Kfish, welcome to the forum!
Nah, I don't mind at all. Actually, my username is both based on my name(s), on the fact it'd be fitting in a fish forums (and because I'm not creative), and also the typical abbreviations for "Just Kidding"
I actually find this very amusing, and I doubt anyone could mix us up, unless your profile picture would just so happen to become a red veiltail and they were reading quickly XD.
No need to feel worried or sorry, you didn't do it on purpose, and even if you did it'd still be fine. There are actually some user's with names exactly the same like 1fish2fish and OnefishTwofish and such.
Lol, what can I say, great minds think alike