Nizman, it would be a lot better if you showed us a couple of your games vs humans and vs computers. Otherwise we won't know the reasons why your performance decreases against humans.
IF YOU ARE A GM or TITTLED PLAYER PLEASE! I REALLY NEED UR ADVICE

Anything unorthodox but good will be able to beat a normal comp. But we cant come 2 a conclusiom if u dont post some games.

I think you are misleading us.
Maybe you are just taking back your moves, your blunders when playing computers, and playing human you are not allowed to do that.

OP, you said you're slowly losing interest in Chess since you're not winning ... well, then take a break. Nobody's forcing you to get better.

@OP: I think you are placing too much pressure on yourself. Chess is a game and should above all be enjoyed. Enjoy the games whether you win, draw, or lose. Improvement will eventually happen.
Grandmasters and other titled players get as good as they are because they first enjoy the game. If they didn't, they would likely quit. After all, why torture oneself by playing a game one doesn't like? Enjoyment of the game is the top priority.

Keep playing against humans, thats the best way to get better. Join a club, keep practicing tactical trainer exercises, do chess mentor, how old are you ? You sound young, and seem impatient, Rome wasn't built in a day.
You also have to enjoy the game, if you do not get enjoyment from chess whether you win or lose, you will lose interest eventually anyway, and perhaps you should find something else that you like more. Play lower rated games, if winning is that important to you.
Good luck

Progressive and steady improvement is the way to proceed. Sometimes with chess this can be accompanied by intuitive leaps in understanding.

Patience. You can't climb a ladder by jumping to the top rung on your first step. The beauty of chess is that you can have a great game playing at any level. The satisfaction that comes with playing a move that outwits your opponent is as great at level 1200 as it is in the 2000s. Losing is not as much fun, but it should teach you something every time and still improve your game.
When you're not playing, practice. But structure your learning:
1. Tactics (tactics trainer)
2. openings. I notice you're playing the Ruy Lopez in one of your latest games.
3. Endings.
Practice each in turn. Good luck.

Another thing is that maybe you've learned to anticipate something about the way the computer plays that weaker players don't conform to, and can't really deal with the randomness of random players. That may be relatively easy to overcome if your skills are strong, or not.
But the question, when tackling something lofty, if you're passionate, is not, "When will you succeed?" but "Will you play until you succeed?". You play until you can cope at the level you strive for, instead of putting the time limit on 'when'. Very different attitude. One says you're truly dedicated and will do what it takes until you succeed, and one says succeeding is not your highest priority. I doubt many will achieve GM without making it a very high priority and putting everything into it. And maybe some really can't proceed past a certain point. Not everyone can be a Mozart.

Who knows? You're the strongest opponent I ever challenged, so it's interesting to me, how exactly you will beat me. You made incredible progress since you were so depressed in the OP, and I'm curious to see it in your play.
I practice chess every day.. I study grandmaster games patiently till i understand especially paul morphy games.. And i beat alot of computers but whenever i play against amateurs and lower rated players say 1200-1500 ratings i fell to deliver the moves i execute when playing against strong computers. Why is it so? How did u guys become GM's? Why am i not getting better? Please !!!!!!!!!!!!! Help! Am slowly loosing interest in chess.. I love chess please help me? Advices. Thank you in advance