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You should know the reasons why are you so bad at chess . There's no shame to accept your weaknesses at chess . You should never quit chess.
The solution is to do continuous practice. Solve puzzles.
Lets Know to Improve:
You should know your openings : You should not decide the opening when your opponent plays certain moves. Understand the openings don't learn them. You should always try to understand set-up based openings because you can play them against almost anything.
You should practice Puzzles: Puzzles improve us Tactically, they are on chess.com . You get 4 puzzles free daily.
Analyze Yourself: When you complete a game open the Evaluation bar and check where you started dominating or losing. If you can't you should use Chess.com Analysis.
Always Look For Checks Captures & Attacks: They are candidate moves you should always search them and check which one looks good. They are most important in middle Game planning.
Play Bots: Chess.com provides you with much amount of bots you should play bots rated 100 points greater than you.
You should know Your weaknesses.
Learn more:
Want to Improve Tactics: https://www.chess.com/blog/Iamplayerofchess/chess-tactics
Learn Beginner Openings For White: https://www.chess.com/blog/Iamplayerofchess/openings-lessons-white
Where Is Daniel Naroditsky: https://www.chess.com/blog/Iamplayerofchess/where-are-you-danya
Ending the Game Perfectly: https://www.chess.com/blog/Iamplayerofchess/end-the-game-with-perfect-endgame
Thank You