system
A chat on 4chan
human
Just making it a habit, and faith in your growth. There isn't a secret magical technique that doesn't include changes to either of these things. It's just that when you lack confidence, just doing what you are scared to do doesn't work. So you have to do empowerment, so as to just do it, because doubt causes more doubt, and confusion. Blind faith is commanded by those who know, to those who will never know without jumping from here, to then. The abyss between the two is very wide, because its unknown. So pray to god for strength to move forward, and you will move as far as your faith goes, and then faith will be reified by results, making faith confidence, and breaking confidence in reality is very hard to do.
gpt
In short just do it, because when you do it your confidence in ability goes up, and then it's just about validating the efficacy of what you are doing. There is almost no chance lifting weights won't make you stronger, that is deluded. If you can't make that first step, don't rely on God to carry your burden into the gym, but you have to follow him there.