you may want to take a short break if you're having a downswing (like two days or so) then just reevaluate your play after every hand and be happy when you get your money in with the best of it, dont let the bad beats tilt you.
if you keep having trouble it probably means you're just outskilled, read some material, watch videos, read posts and and adapt your play. Also dont be afraid to drop down a limit to give your bankroll a breather, for NL holdem you should have 20 times the max buyin (20x25$=500$).

Oh yes since you play at Party, dont look further its rigged XD