Should I Quit my new job?

I am asking this here because I know folks here can relate.

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I started a new job back in April and had to change cities. But things have unfortunately taken a downturn.

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In my previous role, I was the main backend programmer. Led the project with two other backend devs, wrote most of the API and added functionalities I’m really proud of. Things got awry so I left my previous employer (salary slashing – a startup with it’s first product in beta)

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I joined a new company and was given my first project, which I estimated was going to take 6weeks – A HR management system. With some resources not provided on time, the code having no test and the project has lingered for 8 weeks. While 99% most of it is on the test server and is working, I feel a sense of incompletion.

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I was given a simple “search and update” task to perform the other day and to my amazement nothing came out. 3 days straight and I couldn’t do something that simple. I currently have ADHD, went for drugs (Modafinil), which worked the first two days only. I’m not pinning my lack on productivity on this.

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I feel kind of incompetent in my skills judging by the stares I get from the team. I’m looking to tell my manager to end my contract because I know my work is subpar and heavily below standard. This is my third month here and I don’t know why this is happening.

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If I do the above, I will be out of work and have no savings whatsoever but will be able to hold my integrity and not get sacked like I was a fraud. What’s your take on this? Should I quit or continue?