There are two main reasons why you are unable to take decisions.
1. When there is some feverishness of desire attached to it; or there is some greed. Then you find it difficult to take a decision
2. When there is some fear in you, then also you are not able to take proper decisions. The mind gets stuck in between greed and fear, due to which we remain in confusion. So just get rid of the fear and the greed. That’s it!

How can you develop the ability to make good decisions?

Intuition, Intuition and Intuition.

And remember that which gives you long-term happiness and short-term problem, is right. That which gives short-term happiness and long-term misery, is wrong.

Just look back at your life in the past. This is not the first time that your mind is confused in a dilemma. You have faced these types of questions and situations many times earlier as well; and every time you have received help to overcome it.