If you've got the Psionics Handbook, a Psychic Warrior could be interesting and fun to play. Which particular Prestige Class were you planning on getting? My advice to you would be to create a character history that indicates skill or a focus in the area of said Prestige Class, and begin working towards the Prestige Class once you enter the game.
Talk to the DM, and explain what you want to do. Don't get mad about this, as it will only hurt your case. If you can convince the DM you are willing to work towards the Prestige Class, and have a good reason for doing so, I'm sure he'd let you at least try. If not, and you just aren't having fun anymore, leave the campaign.
Not everyones playstyle is going to be the same, and if you find your playstyle conflicts too heavily with the DMs, and you are not enjoying yourself anymore, simply leave. There are other things to do with your time, and you shouldn't play D&D unless you're having fun. It is a game, after all.