Well, I took a quick look at your game and here's my analysis on it. I'm not sure if my analysis is accurate or not though.
It seems like the reasons you lost in the first game and the fourth game are due to a combination of pawn weaknesses and some tactical mistakes at some point like in the fourth game where you gained the initiative and played 32... Qh4 which allowed Qxf5+. Pawn weaknesses, although not always bad, requires you to know how to play with them and seek active counterplay.
I don't understand what strong players "see" during a game that weaker players don't "see". I am starting to think it is whole just memorization or accurate calculation. Understanding positional themes and tactical ideas is foundation. but during an actual game, they are probably just calculating variations based upon those foundation ideas. do you agree?
Here are some of my games below. Could you suggest how I can get better. I played in a live over the board rated event last weekend and I got clobbered.
can you help me explain why i lost
Round 1
Round 2
Round 3
Round 4
Thanks