First off, screw everyone else.
I lift at home, but when I have gone to gyms and I see people out of shape, over weight etc I think it is awesome.
None of us are perfect and we can ALL be in better shape.
And is what people think about you more important than your health? is it more important than feeling better about yourself?
The bottom line is you need to be happy with yourself. Dont go to the gym for anyone else but yourself. and dont NOT go to the gym for anyone else but yourself.
If you went one time did you work out real hard and were sore for a few days to a weel afterwards?
I have seen that happen to people, they are motivated to go, and motivated to workout and the first time at the gym they push themselves so hard they cant get out of bed the next day.
So when they finally can move in a few weeks, their mind is telling them "NO WAY!!!!"
do this Paul, go to the gym when it is least crowded, and then when you go start off slow. Maybe go do some light bench, then after a few light sets of bench go do some ab routine. Dont do ANYTHING that hurts or makes you sore for the first month.
Then after the ab routine go jump on the treadmil for about 10 minutes and just walk.
Just do this routine every couple of days, dont spend more than 30 minutes in the gym maybe three times a week to start off with.
What you need to do is get into the habbit of going, get used to going on a regular basis and take it slow. after about a month then maybe start going 4 days a week. and increase your time to 45 minute sessions.
As I said, the most important thing it to establish a routine, once you establish a routine of going, increasing how often you go, how much weight you push, how long you run is easy. just go.
And again as far as anyone else goes, honestly most people dont care what you are doing, they are worried about themselves. So just worry about yourself..
It is a lifestyle change, just do it.... you will be glad you did