Jaime Alguersuari has said that Formula 1 has become an auction after failing to secure a race seat for the 2013 season.
The Spaniard was dropped by Toro Rosso at the end of the 2011 campaign, but says that he believed he would return to the grid for the coming season, having been linked to a number of teams.
The 22-year-old told Autosport.com: "I assure everyone that I have been convinced for most of the 2012 F1 season that my seat was secured in a team that usually scores. So they did tell me and I believed it to be true.
"Due to this conviction I passed up other opportunities in other championships. Those who committed themselves with me have given me reasons that I must accept but that I do not share. F1 has become an auction.
"Is my career over in F1 at 22 years old? Despite everything, I strongly don't think so. I know how old I am, I know my track record and I'm convinced that I deserve a winning car in F1. And I will keep fighting for it."
Alguersuari, who has raced in 46 Grands Prix, will continue as a test driver for F1 tyre supplier Pirelli.