Burning your bridges is not something to be taken lightly. It requires careful thought and reflection. The process of deciding your purpose in life and what you want out of life can be a long one and can take many months and even years of refining as you get to know yourself better and explore the possibilities life has given you.
But once you reach a point where you know what you want out of life, you need to burn your bridges. You must let go of all other options and pursue the thing that you truly want. In reality this may be several things. The point is that these things make up your vision for your life. That is the vision you must be totally committed to.
Do not say to yourself “I will try to be a great singer and if that fails then I will try teaching.” Such light hearted decisions rarely bear lasting fruit. Decide to be a singer, if that’s your passion in life, and stick to it relentlessly. Having options makes you lazy and makes you lose out on any good opportunity that comes your way. Having options also makes you unfocused and undetermined!