Dropped suddenly by Toro Rosso team owner Red Bull at the end of 2011, the Spaniard was just 21 but managed to stay in the paddock as Pirelli's test driver.
He was hopeful he would bounce back onto the grid this year, but drivers with powerful backers and sponsors leapt to the front of the queue.
Now 23, Alguersuari is not so sure he can expect a future in F1.
"The future? I don't know where I'll be," he told Spain's Radio Marca.
"I had hoped that Formula One worked differently, but (in F1) two plus two does not equal four."