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[Noogai03]

I started directly from XNA, which was probably unwise. Since I'm an XNA guy and XNA is good for games with C# imo I'll post some good XNA tutorials: I began at http://riemers.net and started learning it from there. He does XNA tutorials specifically in 3d, 2d etc.
A couple of days in I then realised I didn't know enough about the language and so went here: http://rbwhitaker.wikidot.com/c-sharp-tutorials
For me it clicked properly once I found out about reference and value types.
Riemer is good because his tutorials involve complete games, whereas R.B. Whitaker does more tutorials on more random topics, like normal mapping shaders, etc.
Don't be put off by Riemer's site, it does look a bit terrible but the content is good.
Also when stuck try stackoverflow for general programming, and either TIGS or gamedev.stackexchange.com for gamedev-specific issues

[Maud'Dib Atreides]

2D 2.5D basic 3D

http://sgdk2.sf.net

Give it a shot, it's how I learned C# when I was a wee lad and now I'm like light years ahead of my freshman programming class

[TomHunt]

Unity is pretty easy to pick up, and so is C#, and they're both very well documented online, so you can go and teach yourself how to use these more or less for free.

Learning the language and the tools is really the easy part. The less-obvious thing to learn is the computer science stuff like algorithms and data structures and the more general how-everything-works of computers. If/when you go to college, that stuff should all be part of the program, but you can also pick it all up on your own for free if you just keep experimenting.

If there are game dev meetups in your area, I would suggest going to those and meeting as many people as you can. In particular, you'll want to find at least one really experienced person who'd be a good mentor and be willing to do stuff for them for free. Just being around more experienced people in person will help to bring you up.