Confidance is a process which can be achieved for the same there are some steps -

1. Accepting the reality

Accept if you are not perfect. It'll give you a chance to learn and improve.

2. Mistakes are important

The things we learn from our mistakes cannot be learnt from anywhere.

3. Positive mindset

A positive mindset will always motivate you to have a positive approach of every situation.

4. Learn skills

Knowing more skills will give confidence to you from inside.

5.communication

Talk to the people, know them building a network. It will be like a practice which gradually increase confidence in you.