Do you expect your physical health and wellbeing to be perfect at all times without action from you? No, you feed yourself, you rest, you keep active, you see the dentist, wash your hands, take vitamins or medications when you need it, take care of yourself when ill, seek medical help if you have an injury, and you recognise that sometimes it's just luck (either good or bad).
Your mental wellbeing and physical wellbeing are connected so some of the things you do to care for one helps the other.
There are some unhealthy and toxic attitudes to mental wellbeing, mental health, and mental illness on here at times so take things with a pinch of salt.
Being kind to yourself and recognising that you're a human being with emotions helps! Emotions are internal communication. They can be useful if we learn to listen to them instead of pushing them away and suppressing them (which is a recipe for illness!).
If the worrying is causing you difficulties then there are resources specifically for that you could use. No shame in that. You can self refer for IAPT CBT which is for mild difficulties. There are CBT resources online based on CBT (try googling "cci looking after yourself anxiety" ) and the "books on prescription" scheme has titles you could look at.
There are skills you can learn, strategies you can develop, activities you can choose, connections with others you can build, and some of it is luck as to the hand life deals you.