I've transplanted more seedlings like that than most have grown seedlings. It's less damaging to the plant than you'd think, but don't be overly aggressive when digging 'em out. Nice-n-gentle.

Some folks only visit the site once a day to offer insight and chat. But I'm with WW on this one. Would be nice to see ya relax a tad. Freaking-out will not make you learn faster. As a newbie, perhaps it would be best if you waited to freak out, till AFTER one of us tells you it's time to freak, lol. You're killing any positive energy you might have...

Heat is likely the the reason your leaves 'reach for the lights'. But I have grown under extreme heat conditions for the past decade almost, and can say from experience...as long as the bulb isn't burning the leaves, the 'reaching for the light' is virtually a non-issue. (within limits, of course) I wait to turn-on my A/C till it's 90 degrees (ambient) inside. They adapt quickly and it mellow's out. But keep the bulbs off of the plants.

Once a male, always a male. Once a female, always a female. They don't 'convert'. You can stress 'em into hermaphrodism, or they may have weak genetics to begin with...but seedlings are not afflicted with hermaphrodism. If stressed too much, seedlings will die long before you even get a chance to tell what sex they are. (were)

Also, before I forget...
Growing cannabis you'll ear lots of advise from all sorts of people. DO NOT just jump into doing something because you read it, and beware of marketing hype. I've seen folks get all hot to trot trying something new, and end-up ruining their crop. If someone tells you to do something, or a company says their snake oil is the bomb...Google it to see what other's think.