Looking at your games, your positional decisions are phenomenal. Unfortunately for you, positional skill is of very little importance for winning games when you're below 1200 Elo. You're at that awkward Elo spot a lot of players have where you're good at offensive tactics, but defending against them accurately is inconsistent. Chess punishes defensive mistakes far more than offensive ones.
Your first game in particular was an extremely strong positional game by you. You worked the positions and was up both in material and position. Kf5 is just a tactical mistake.
In your second game you missed taking the knight on move 24. You night have seen that and was concerned about g4 but material is always more important than position. Taking with pawn instead on move 32 would have been a better positional move because it creates a passed pawn, but rook takes is an understandable move. Ultimately it again came down to tactical defense. On move 40 you had to defend with Qb6, a not so obvious defense, and was promptly punished hard for that mistake.
Spending tempo or dedicating pieces to overprotect your king can be a good and practical approach. That and as always improving your tactics should help you score more wins.
can someone tell me where do i even go wrong???? i tried everything to follow all positional concepts but i still end up losing everytime, it always happen like this where in principle i have the advantage but the opponent still end up beating me at the end. maybe im just venting my rage here , fcking stupid.