First of all, you need to have to believe in yourself and be sure that you can always make yourself better because improving yourself physically has more to do with your mind frame than your physical efforts.
If your mind is not ready to accept your work out then, you can never work out. I have seen people joining gyms but after few months, they end up complaining that whole of their time was wasted and they have not got any advantage out of this gym routine.
This happens mostly due to improper mind thoughts. When your mind is not ready then, you cannot work out properly and with full concentration. You need to have some passion for training and without that passion your training will be just a routine.
If someone has told you that from doing physical training, you always need some expensive equipment at home or you have to pay expensive and heavy fees in gyms then, he has misguided you because there are so many ways which are totally free and they can make your life so much better.
These methods will not take much of your time and money and will change you completely physically.