There are lots of places in here where one could split hairs over technicalities, but I've gone with the broad spirit of the question rather than the painstakingly precise answer.
I used to breed exotic show fish
True. Though I never actually showed them, I used to breed Betta splendens. That's one of the reasons I get pissy when I see people talk about "beta fish". Unless it's an early engineering release, it's a betta not a beta.
I've taken part in a debutante ball
Disturbingly true. My dance school used to provide pages for the Veiled Prophet Ball in St. Louis. See the two girls following behind in this photo, and the ones carrying the peacock fans in this one? Totally me. I may well have carried one of the fans in that photo. I spent countless Saturday afternoons practicing the goofy-assed walk and the exact steps that we were supposed to take for the ceremony, and to this day I could still do most of it.
I've flown over one million miles in my life
False. I've done around 250K on United, and maybe 100K on other airlines. I honestly don't know what the bottom line is, but it has to be less than half a mil.
I got kicked out of college
True. I probably could have talked my way back in, but didn't.
I'm allergic to leather
True. Almost everyone got this wrong. I'm allergic to the chromium salts used in tanning some leathers. It's bothered me all my life, though I've only recently discovered exactly what the allergy is.
I've never done illegal drugs
True. OK, 99.99% true-- there was one joint back in college, but I was so drunk I wouldn't have known the difference. This is largely due to the quirks of my personality and how I manage them than anything else. It's easy for me to draw a hard line in the sand and never cross it. I don't want to find out that there's something that I really like and then have to enforce moderation on myself.
On the flip side, I like reality more than I like feeling impaired, so I can't see any reason to bother with drugs.
I got married when I was 20
True. And just barely 20 at that. The photographic evidence is publicly available. It lasted the better part of a decade before I came to my senses.
I've never learned to roller skate
False. I spent tons of time in both roller rinks and ice rinks when I was growing up, and had above-average competence at both. I tried ice skating last year and it wasn't pretty-- I think I could probably still roller skate well enough, though.
My favorite aunt isn't related to me
True. She's my half-sister's aunt, but has always treated me like family and vice versa.
I graduated first in my high school class
False. However, I'm miffed that most of you thought this was false! I was in the top handful, though, and probably could have been first if I'd made even the tiniest shred of effort.
I've never seen a full episode of Star Trek
True. I dislike both TV and science fiction. While staying with some friends after the abovementioned car accident I did see most of an episode, but left the room for a few minutes so I could keep the streak intact. (I thought it was dumb.)
I've been on a magazine cover
False, to the best of my knowledge.
I acted in several plays in high school
False. I did a lot of backstage work, but I can't act for beans. I really wanted to, and I kept auditioning, but I kept sucking. I was in the pit orchestra for several musicals, but that doesn't count as acting.
I spent my 12th birtday in Moscow
True. Technically, it may only be partially true... I either flew home that day or the next one.
I've owned two sailboats
True. I had a Hobie 16 in St. Louis that I had to sell before I ever got it into the water (long story), and a Force 5 that I nearly killed myself on.
I've walked naked through the streets of San Francisco
False. San Francisco lucked out on that one.
I have three body piercings below the neck
False. Though I do have three above the neck.
I've been certified as a lifeguard by the Red Cross
True. I wanted to be a camp counselor at my boy scout camp, and a lifesaving certificate was a requirement.
I used to smoke
True. It lasted maybe a year or two in my late teens.
There's a motorcycle engine in my living room right now
True. It's from a late 60s Ducati. The frame is in a shopping cart in the living room, and the rest of the parts are scattered about the loft. I'm very slowly restoring it.
My hair is mostly gray under the pink
False. I look whenever it grows out, and it's still mostly brown.
I've never met my father
True. Well, not when I was old enough to remember. My parents divorced before I was a year old, and my father died when I was five or six. I don't believe I ever met him.
I have a ham radio license
False. I've never had even the slightest bit of itnerest.
My left thumb doesn't work right
True. I broke it pretty badly in a car accident about 15 years ago. It's close to normal, but lacks some flexibility.
I keep my loft rather cold
False. Totally and utterly false. I despise cold, and think 75 is a perfectly reasonable setting for a thermostat.