Some people love training, others don't. Is training then a necessary thing to do?
Yes, it is. I'm not a professional but I know for sure that training only will do good things to your body if you train in the right way. Everybody on this planet may not be a fan of sports or training so my tip is to find something that you love even if it's just walking around outside for an hour or two it will only do good to you. Your body will get the exercise it needs and you will get fresh air and time to clear out your mind. Everybody is capable of training. We are all different but there is still exercises out there that are meant for you and people that will have the same interests as you. So gather those people and train together, do something fun so that exercising isn't a forced thing, it's something you want to wake up every day to do.
You choose your happiness so choose wisely. Choose something that you want to do and you will have the motivation to do it every day.