okay to make my answer way more obvious:
to get into a studio you gotta make friends with people and kiss the asses of its members... (of course with some studios this might not be enough, get on TF2 or Left4Dead and join the Steam AMV group and you might have a better chance too

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Of course if you are wanting help/feedback you can always be more active around here, make friends with people, socialize, get off of the boobtoob long enough for someone to see your actual files rather than reconverted flv files, and pretty much ask for it. I'm sure plenty of people around here who are willing to rip your video a new one.
1. If you want to show people your skill, then all you have to do is list and make your video here and make it available for download, if you really have talent or skill eventually someone will recognize it and spread it around a bit.
2. You are already apart of it if you are making videos, leaving comments to other videos and socializing with the community, being or not being in a studio won't change that.
3. Once again being in a studio isn't about skill level... AMV studios are groups of friends that like to put stuff under the same name. If you really want to be in a studio either make friends with people and make one yourself, or try to make friends with people already in a studio.