So in otherwords you play a tank that's strengths are; taking damage, interrupting and dpsing. (in order of greatest to least) and you failed to prioritize your abilities with those strengths, by going DPS, take damage, interrupt.. (did you even interrupt once?) and lost a 1v1.
Too bad those strengths are non-existant. For a Powertech, if you spec deep sheildtech and actually use the tank gear, you are just as squishy as a dps, barring a few extra hp, and do significantly less dps while also having less interrupts/cooldowns than a dps spec. That's not even going into the fact that interrupts in this game do very little, 8 second cooldown that only affects 1 spell instead of entire spell tree for 4 seconds, at the cost of heat and damage is pretty much useless in pvp.