Is a chemistry degree worth it?

Work life balance is a feature of your job, not your degree. Your degree will not necessarily determine your job, and most graduates go into roles unrelated to their degree.
The first thing you need to determine is if you actually want to be a doctor. If not then there's no point considering medicine, regardless of job security. Equally if you do want to be a doctor, nothing else is going to allow you to become a doctor or do that job so accepting the working hours is part of what being a doctor is. However it's also worth bearing in mind not all specialties have the same working hours and some may simply be largely 9-5 (or 8-6) jobs with little or no out of hours requirements. And it's up to you to determine what you want to specialise in, and work life balance is a major consideration for doctors when considering their specialty areas as I understand.
Regarding chemistry, its also important to bear in mind if you enjoy chemistry and want to continue studying it, there's really no other degree that allows you to study chemistry in a substantive manner. So it's really your primary choice if you don't want to be a doctor but do want to continue studying chemistry.
However as above, your degree doesn't determine what job you do. While lab based roles with just a bachelors/MChem are probably going to be more limited in scope and lower paying, with a PhD and experience you may be able to live comfortably. Equally with just a bachelors/MChem you could just as well go into any generalist grad scheme in e.g. accountancy, the civil service, law and legal services (e.g. patent attorney work), other financial services, banking or management consulting, etc, etc. You have a lot of choice in determining how you want to balance salary vs work-life balance there. While most will be unrelated there may be scope in some to leverage your scientific background (e.g. in the civil service - which I gather struggles with recruiting for STEM related roles in general currently?).

I understand that but what i mean is with chemistry degree i can work hybrid jobs and have more flexible work hours.It would take quite long as a doctor to get to that point of specialisation especially because my interest is specifically in surgery.

Several points -
Doctors begin their specialty training after completing the foundation programme, 2 years after completing the medical degree.
You shouldn't decide on your preferred specialty before even beginning your medical degree, as regardless you will need to study and work across the whole of medicine for your whole medical degree and the foundation programme. Also necessarily all surgeons will work long hours and not wanting to work long hours but wanting to be a surgeon makes no sense - it's like wanting to be an economist but not wanting to do maths. Fundamentally I think you don't want to be a surgeon and have chosen it for less legitimate reasons such as perceived prestige rather than anything to do with the actual job itself.
Also hybrid working is very variable and dependent on the employer (and you wouldn't be able to work hybrid as a lab tech for example as you'd need to be in the lab) and flexible working is also employer dependent. However doctors can and do work less than full time including during training.
Have you done any medical work experience yet?

Not much experience but i have been volunteering at a hospital. I wanted to go into medicine due to my interest in surgery specifically cardiac surgery. it’s nothing do with prestige I genuinely want to help people and I really enjoyed learning about the heart and surgery the process of it i find it intriguing. But obviously I didn’t do much research because medicine is something i wanted to do for a long time so i didn’t even think about the work hours or anything. I don’t know what to do honestly, like there are things i want to do like start side business art related and also go to pilot school for private license (random things) and i just feel like it won’t be possible with med school. With chemistry i’m mainly interested in research and more of the materials side. I need to apply this September so i want to make up my mind before its late and i have to rush everything.