Politicians are well known to use spin as one of their tools, listed businesses also. When it is used from one country to the next we call it propaganda. But what do we call it when we use it as an individual?
Pride, boasting, egoism, denial, twisting the truth, fibbing, lying!
It is not merely putting your best foot forward, it is claiming that your foot is better than it really is, that you are more that you really are.
How often are you willing to let people think you contributed more to a project than you really did? That success was due to you more than it really was? That your faults are smaller and your strengths greater than they really are? If truth is your goal, then spin cannot be.