That's the story of the lobpot. It happens to me over and again.
The solution is to have a clan of good people that will push with you. Hell, even a clan of average players that push a side together will destroy a team of good players that are all rushing strider hub, singu and commorph at the start.
If you can't get a team together then look at what players play in your style and plop near them. I'm lucky I'm in a clan with players that can be extremely aggressive when they are in the mood and then it all works like clockwork.
If you're out of luck there, then I suggest building raiding units and sending them to harass your direct opposites while you queue expansion. Don't try kill other units, only eco and constructors, and make yourself a big nuisance. Every second they waste trying to hunt down your kodachi is pure gold as you consolidate your expand.
A final word of consolation: often when I'm the lone idiot trying to push on his own, I look back on the game and realise that I bought enough time for the rear guys to get their big units into action and possibly win, even if I'm dead. I ragequit a few games and then the team won. Looking at the replay it became apparent that my sacrifice allowed the big stuff to be built that won the game.
