The idea in believing in your self is a matter that was taught to our own beloved Prophet (peace be upon him) from the very beginning of revelation. When angel Gabriel told him to read three times and he was answering in the genuine status of what he thought of himself (peace be upon him): I know not how to read!” But then the angel told him what to read so he can follow in the verses.

 

When he went to his wife Khadijah (may Allah be pleased with him) and told her he was concerned about himself and what people would think of him, she (may Allah be pleased with her) told him lots of good words of support and that if there is a prophet to be sent he is the potential one.

 

The verses that were revealed later on him (peace be upon him) chapters 73 and 74 (Al-Muzzammil) enwrapped messenger and (Al-Muddathir) mantled messenger , both chapters taught the Prophet (peace be upon him) how to believe in himself and in the mission he is about to take on.

 

With such examples from the life of the Prophet (peace be upon him), I can tell you, all our faith and religion is about having faith in your abilities to establish matters of goodness in our life and that is the idea of the term (Takleef) or liability in Islam is built on.

 

On another note, take for example the Hadith of the prophet (peace be upon him) that relates directly to your case: “the believer who socializes with people and handle in patience their harmful (matters) is better and closer to God than one who does not.”

 

With this being said, seeking knowledge of how to improve yourself with such skills by learning the Seerah of the life of the Prophet (peace be upon him) is a great thing to do. Also, there is nothing wrong seeking professional help from psychologists that can give you some tips on particular areas of methods of self-confidence, social skills etc.

 

Wish you the best.