Staying fit is important for a lot of different reasons. For starters it can help you become much healthier than you were before, and this can be immensely useful because of the fact that it would enable you to live a much longer and happier life. This would give you the time to do what you are truly passionate about without really having to worry all that much about how much your health might be declining, something that can be a real stressful thing to think about on a regular basis.
You would also want to try and stay fit because of the fact that it would make it easier for you to feel good about the way that you look. Looks matter no matter what anyone else says. Looking good can help you gain a lot of self confidence, and an added benefit is that when you look a certain way people will respond to you differently as well.
However, in order to get fit you will have to work quite hard. This might involve going to the gym, but doing so would potentially not be all that ideal for you if you think about it. The reason for this is that you would have to spend a lot of money on the gym, and you would also have to go all the way there in order to reap the benefits.
It would be a much better idea for you to just get a mini exercise bike that you can use at home. The bike would be around whenever you need it, and chances are that if you are using it on a regular basis you would end up losing weight quite quickly.