That's ridiculous. If I can pick my type, there's no reason I should be limited against my own.
Anyway, here is what I would favor in myself:
1. ESTJ. Yes, it's the one I already have, and yes, it's the most hated type on here, and yes, it's among the most hated types of the people around me.
SUCK ON IT But if I stay positive, I should eventually find someone I click well with.
2. ESTP. I'm nowhere near being a P, but I don't know what it's like to actually be one. My old closest friends all seemed to be this type or close to it and I think I would've gotten along a lot better with them had I been less anal about everything. Maybe I'd enjoy life more and live it out like every day is a new day, like they always say. I've just always had a very strong preference for J and I couldn't imagine what would would happen if I lost it- loss of sense of responsibility and timeliness and such.
3. Uhh... hm... ESFP? I dunno. Same reasons as ESTP, and they seem to get along with people and be very charming, but I think Fs are less emotionally stable or whatever. Bleh...
As for what I wouldn't want to be... I just wouldn't want to be an introvert. Or would I? I don't even know. Some of you guys seem content with who you are, but I certainly wasn't when I spent a lot of time isolated from people in the past. Even for the past few weeks I've been unable to interact with people- well, anyone worthwhile, anyway, so it's almost been like social atrophy for me.
Wow, I'm getting really personal with this. Why did I have to wake up so damn early...