my percentage is something like 35% or 40% or something, and i've been playing for what seems like ages (lol, ages.)
anyway to start with i played 3 games against computer then got bored and went online only to be beaten like 15 times in a row, then decided to play a team game and got lucky with my ally, won that one, and then gradually have been getting better just by playing against people online.
basically, this has meant that my percentage is not good at all and doesn't reflect how i play now (at least i hope not) but i learnt everything i know from this forum, watching 4 replays and losing a load of times against people online.
screw the percentages. screw the ratings. what really matters is how much you enjoy it when you put a load of effort into a game and end up kicking ass after trying over and over again to get a victory.
or, if you really get fed up with that, get someone else you know who has the game or get someone else to buy it, and get better just from playing them over ip/lan, you'll probably be better than them and you'll complement each other greatly by getting gradually more skilled against each other.
and if all else fails, just get a build order off this forum, and that'll put you in a great position by the time fortress age rolls around, probably a better position than your enemy.