My play style is tight aggressive, play less than 10% of my hands, take most hands down before show down.

I believe when I cash it is because of skill rather than luck, given I usually don't get monsters and rarely see show downs. But I noticed a pattern where I tend to stay just above even, and I'm starting to wonder if it's variance or my play isn't good enough yet to be profitable.

Example: This past wknd I made $410 in three winning sessions, then today I lost $360 in one session. This is how it usually goes for me, I grind out winning sessions for a wknd, week, 2 weeks, rarely winning big anyone time, then have a day or two where I lose 2 buy ins.

Hands:
The winning session this wknd, 1 flush, 1 three of kind, the rest pairs, usually taken down before showdown (so I don't feel this was a hot streak).

Today's losing session - KK all in against AA, pair of aces king kicker to 2 pair, pair of aces king kicker (all in on turn) to ace high straight, 88 (low board) to set of 7s (all in on turn). I don't believe I go on tilt b/c I don't expand my hand play, but I know I must look different, b/c I feel different on these days, but the card room I play in I don't think too many ppl are trying to read the players.

Is this variance or are there obvious things I need to work on? Any help is very appreciated, with classes morning and night I can't work a normal job unfortunately.

well you didn't give stack sizes but some of those hands make it sound like you over value TP and overpairs?

playing less than 10% of hands to too nitty - you are missing out on many +EV spots if you are really playing this tight

Take advantage of your image and position widen your range in certain spots and pick on the weaker players... Read boards more carefully the flop turn and river tells a story most of the time you can figure out what your opponent has and like the guy above said don't over value hands even aces can be beat post flop but some hands you have to chalk up to "its poker"