That was pretty much what happened with me.
I saw a "huge" thank (well now that I think about it, it couldn't have been more than a 20 gal) when I was a little kid and I just couldn't let it go. I whined to my parents about it until they gave up and finally let me get a 5 gallon tank (not much, but I thought it was great than). I was an idiot than, and a lot of my earlier fish died, but over the years, I have really grown attached to my fish and so has my dad.