Trust is something that we all would like to have in all of our relationships. Trust is something that has to be earned, is highly regarded and can be easily broken.
Placing trust in ourselves is something that is developed over a period of time. Like other relationships (yes you should have a relationship with yourself), when trusting yourself, it requires a measure of belief.
In this life having a healthy trust/belief in your abilities is necessary. Without that trust, that belief in your abilities it will be easy for others to tell you who you are and what you’re not capable of. Likewise, a lack of trust in self defeats the purpose you’re born to as you convince yourself of who you aren’t.
Trust in ones abilities is not being conceited; its understanding who you are and what you’re capable of. Trust your gut and trust that you are all that you've been set on this earth to be.