When you project self confidence you get further ahead. You feel better about yourself and people like to be around you. More opportunities open up for you naturally. Not everyone is born with self confidence but even if your confidence is low, there are some things you can do to improve it.
Such as
1. Accept and respect your yourself
2. Participation in activities that you enjoy
3. Make small targets and strive to achieve them
4. Try to be in the circle of confident and successful people.
5. Listening to other along with to be aware of yourself is also an important aspect.
6. Always keep check and balance within you
7. A practice to write down some short term and long term plans
These all have already been expounded in detail below in the article.