“Paul, an apostle (not from men nor through man, but through Jesus Christ and the God the Father who raised him from the dead.)”   Galatians 1:1

Paul received his calling and title as an apostle, not from or through man, but by Jesus Christ.  The same is true for each of us.  Regardless of who you are and how you feel about yourself.  God has given you a gift and a calling.  Our natural tendency is to look to men for affirmation of our value and to trust in what they can do for us.  But it’s important to realize that man cannot give you a gift or a call.  That may be a bit disconcerting, but take comfort in the fact that in the same way that man cannot give your calling, no man, regardless of how powerful or influential, can ever take away the calling God has given you.  The God who calls and gifts us is the same God who raised Christ from the dead.  Nothing is to hard for him, and that includes opening the right doors for us at the right time.  He will give us the ability to do whatever it is he has called us to do.  Cling to his truth when it seems you are not appreciated, or when doors are slammed shut in your face.  God has called you and God has gifted you.  He will indeed open doors for you in his time and way as you patiently do what he has called you to do.