Advice for a Struggling IB N1 - I Don't Know What Else to Do

I'm a first year analyst in an industry coverage team at a BB and have been there for 4 months, having graduated from uni recently.

I've been struggling so much with the workload and the hours - I know it's common, but there are weeks where I've had to pull almost all nighters and have still had to work past 3am on all the other days. I keep getting told by people around me that I shouldn't be agreeing to take on so much work - but whenever I agree to something the staffer gives me, it's because I don't really have an excuse to say no as at the time my workload seems fine at the time. I take forever to do things and have just eben super slow - basic things will take me a few hours at least as it's hard for me to triubleshoot when numbers look off.

I've honestly been too scared to tell people when I can't do their work, since i'm just scared of upsetting them and in the past it hasn't been taken very well as it becomes my fault for taking on so much work when it was impossible for me to predict that things would get bad. I usually just hope that somehow things will calm down later so that I can do it or I pull an all nighter to somehow get it done.

The result is that my work is full of basic mistakes, bc i don't physically have the time to get things done, let alone check it, especially when I'm so sleep deprived. I've never been this bad at something before and I know that at uni I did well so it isn't that I don't have the ability to have attention to detail or that I'm a careless person when I try

I know this is common for all analysts but I just feel so lost and on the verge of quitting - but also people have told me and they're right, that quitting would be the biggest regret of my life.

My biggest concern is just that people think I'm bad at what I do, which is completely true. But I just hate knowing that everyone thinks I'm crap at this job. Honestly the only reason I picked this was for the money so I guess being bad at it doesn't matter so much as long as I take the money for as long as I don't get kicked out, but it feels terrible to be this bad at something and know that I don't have extra rime available to put in extra effort to learn stuff outside the job etc. to improve. I've really wanted to quit, but I know that that would be the biggest regret of my life since all I really am in this for is so that I can move into buyside and make a lot more.

But I hate how bad I am at this and haven't improved much in 4 months in terms of mistakes etc. Honestly I feel like I'm reaching my limit and don't know what to do.

I've also been prioritising the job over everything - e.g. often forgetting to eat cos I'm glued to my desk, haven't had the time for doctor's appointments/church etc but I'm still so bad at this job

Would really appreciate some good advice or thoughts!! Thanks a million.