To be tired it is only in your mind.
Eat a lot and train hard, I am sure that you will succeed.
Use what you have in your gym. Try to do my training program, you will lose your fat and gain muscles at the same time.
If you don't like don't do it. But don't forget that: NO PAIN NO GAIN.
My MIND POWER gave me this body.
Genetics help to some degree, but the most important thing is the mind and the spirit. These two are even more powerful than physical characteristics that are passed on.