I've never been to a convention before...I think I'll turn in my Trekkie card.
Don't feel too bad. In all my years as a Star Trek fan (how the hell is that boring??), I've only been to one, and it wasn't the best thing that ever happened to me, although, I will admit it was a pleasure to have Robin Curtis lead the entire convention in singing "Happy Birthday" to me.
My mom took me on my 24th birthday in 1994. I haven't been to one since.
I too went only once to a convention. BUT would love too attend many more Trek orientated or even a Comic-Con event. But alas there are not many in the northwestern section of Pennsylvania where I live.
On the note of your mother taking you, my mother suggested we go to one of the last ones they had in Erie, Pa., and although she was handicapped in spent %100 of the rest of her life in a wheelchair. I was touched by the main headliner, Marc Leonard, coming up behind us with must have been the event chairman and giving me a hand in lifting the wheelchair up the steps. I was so star struck and flabbergasted that he would do such a thing I didn't even ask for an autograph!