Free Weight bench press?

I'm a 16 1/2 year old male and work out at the gym, my local gym has a free weight bench press, when you use it you have to use really light weight because the 'bar catcher' has wheels and it keeps wobbling and moving about and it is really high up and i find it extremely unsafe, there is also a stabilizer. should i use the stabilizer because with this i can lift more weight?