>>82303609 (OP)
On the one hand...
>loser girl
It'd be nice showing her life in a positive light, and trying to be the good in her life. Problem? Some of that will come in the means of helping her improve herself. And if you know anything about women, oftentimes if you help them get to a better place in life, and they start attracting other people, they won't thank you for helping them get better. They often would rather use your gift to jump up the totem pole to the next guy. Not every time, but many times.
So, too risky.
On the other...
>extroverted girl that could help you break out of your shell
For one, I'm already an extroverted person myself, so no shell breaking needed. Though on the other big thing, it says COULD. Not will, COULD. There's a pretty good chance she wouldn't even if you needed it, and with that? Well, she's outgoing, she has other options than you. And oftentimes, she'll probably go for the next best thing sooner or later.
So the reality? Neither works out in most instances.