Vitamins etc are only needed if you're not getting enough from your food, or if your body doesn't metabolize what you eat (& it may still not metabolize what you take) or if you need extra due to health issues etc. So first I would suggest that you consider what you are actually getting from your food, what you are not getting, what your daily activity levels are & so what you need of vitamins & minerals etc plus what you need due to any health issues or stress etc.
It does seem though as if what you listed initailly was over the top.
As to natural versus synthetic arguments. Natural is usually best for anything but not always right for every individual or in every individual case as we are all different. Then too there are issues of cost vs effectiveness etc.
I suggest you research, talk to dr, family, rersearch & then start low as some supplements can do damage (also are you on any meds?) so by starting low & building up you can see when you reach a level that seems to be right for you.