You never say what your current level of ability is, but one basic fact is: the stronger you become, the less you will notice improvement. This is because you are becoming more and more proficient in increasingly smaller and more detailed points of the game. Many expert and master level players fall into this perceived "slump". It can happen at each new level you achieve, and is sometimes known as the "Plateau effect".

Keep it in mind that it is not "you". Talk to some titled players. I believe that without exception, they will tell you that they too had an internal battle similar to yours....but fought through it on their way to reaching their present strength.

It can be depressing to guess wrong much of the time when trying to predict a grandmaster's moves.....but keep in mind that sometimes their moves are based on their particular "style" of play, and doesnt always mean that your move was "wrong". Get away from the feeling that your guesses are right or wrong and concentrate more on "why did this player make that move?" and "what can i learn from it".

I'm glad you enjoy playing on chess.net, but I must remind you that playing for the most part does little to raise your level of play. You need to learn new concepts and see what makes GMs "tick" and THEN try implementing your newly learned concepts into your play.

When studying becomes boring, and more like "work", try setting small goals for yourself.....like beating a player you've never beaten before. Or try to get a handle on a certain new variation of your favorite opening....or master the B+N mate, etc. In this way you will have little "victories" that will keep your progress very visible to you and it will put the fun back into studying.

I cannot recommend the Jerome Gambit. 6.....Ke6 7 f4 and yes, white does win back one piece , but 7...Qf6! 8 Qxe5+ Qxe5 9 fe Kxe5 and black is fine.