We can obtain confidence from within ourselves or from outside. In other words, we can obtain confidence from ourselves or from others. In combination, both are good.
The problem with obtaining confidence just from what others tell us, however, is that if they start tearing us down, it can be difficult to continue to believe in ourselves.
When our confidence comes from within us, then no one can take that away from us. It is important that we remember that we can do things, because we have done them.
We know we can succeed because we have succeeded before. Even failure can bring confidence because we know that when we failed, we still survived. Often when we try again, we do succeed.
Feel good about the good things people tell you. Let that build your confidence. But do not rely solely on that. Also build your confidence by telling yourself good things about yourself. Remind yourself of all that you have done and all that you have accomplished.