I'm having big problems on party with big pairs, i'm playing 25NL.

Generally if i get AA/KK/QQ i raise $2 or so and get 1 or 2 callers. Then i usually bet the pot if there are no overcards but then i usually still have 1 caller, what now? I usually bet about 3/4 of the pot on the turn and then another decent bet on the river, even though i figure they must have a big enough hand to beat me, today i had AA, 88 called and flopped quads and i lost my stack, i've also lost about $50 with QQ. The trouble is i'm not making this money back on other hands, the only really big pots i tend to be invloved in are my pocket pairs getting raped

any thoughts?