Oh, yes, you may think you need to have the right amount of self esteem, or the proper training, or the ideal environment, or support from your family, or any number of things. While all these things are fine, they're not necessary. All that's needed is the desire, the plan, and the action. If your desire is strong enough, you'll find a way to get the things you need. If your plan is well-constructed, it will take you where you want to go, as long as you have the discipline to follow through on it.
Life is the result of choices.
You are where you are because of the choices you have made in the past. Your future depends on the choices you make today. You can choose to have that extra beer, or you can choose to read another chapter in a good book. You can choose to act on an opportunity, or you can choose to sleep late. All these choices add up to your situation in life.