Motivation is a strong factor, but can also be very easy to obtain. I just recently started going to the gym to do some working out for the first time in my 41 years. Beforehand, I never felt motivated, I never bothered to do anything. I didn't really care very much at all. Lately, though, I had an incredible wake-up call. My whole life changed significantly, forever. Now, I feel motivated to go to the gym, and, even though I've only been going there for about 6 months, I feel stronger than I ever had; and believe me, I gotta long way to go, too. But I'm also thoroughly enjoying it too. I actually LIKE
going to the gym, as it turns out.
There are probably some times you're not going to want or like going there, believe me, but go there anyway. That's very important to me. You're a relative beginner, too. I strongly encourage you to talk to a trainer and have him to go through some of the basic ropes with you. I'm sure he'll be glad to show you around for an hour. And rember my motto, along with Nike....
JUST DO IT!
Good luck and if there's anything else I can help you with, let me know.