Ever heard of the saying "you can't pour from an empty cup"? This statement is so true and unfortunately gets neglected when we are constantly trying to do good for others. There is a misconception that somehow our wounds and trauma maybe healed by serving others. Whilst this is a noble path, it can often lead to be burnt out.
It is not selfish nor contradictory to say self care is very important. It is important that you look after yourself holistically, from mental health to physical well-being. This really matters as you will be able to do more and help others for a longer period of time.
Therefore don't neglect yourself in this path of goodness, set sometime in your schedule for self care, whether that is going to the gym or enjoying good company.