If you can make it to a good gym, just being around people that are doing great in their training is a motivation. When you see what others are accomplishing, it'll push you to accomplish the same.
You just have to be realistic with the results from your training. Things do take time but each time you go, your benefiting yourself and your future. Being healthy is extremely important, you live a better, happier life.
Alot of motivation is 'internal' within yourself I believe. You have to believe in yourself and have the drive to succeed. Keep your training within a reasonable schedule that you can keep and make it into a routine. Be 'social' at the gym and what I mean by that is if you don't feel confortable there, it's not going to benefit you as much. Talking to others makes it a more friendly place.
When you decide to start training, incorporate healthy eating (intake) also, which is required for good success in your training. Keep at it and best of luck to you!!!! You can do it......