1. Start Working Out.
Nothing will increase your confidence like daily exercise.
You don't need to go overboard. Just 45 minutes of exercise per day can go a long way.
The increase blood flow and endorphins that are released will boost your confidence like nothing else.
2. Work On Your Appearance.
Make time for a basic grooming routine, and learn how to dress properly.
It's not difficult, simply wear clothes that compliment your body type.
3. Adapt strong body language.
Body language has a huge impact on your confidence.
Negative body language can make you more nervous, unconfident, and awkward.
Stand tall, shoulders back, and keep your head up.
4. Work towards your goal.
Achieving your goals will contribute greatly to your feelings of self-confidence.
This type of confidence stems from your abilities instead of vanity metrics, meaning it's here to stay.
5. Own Your Achievements.
Once you've reached your goals, it's important you own them.
You'd be surprised at how many people never talk about their accomplishments.
6. Change from Negative to Positive Mindset.
Simply thinking positively can change everything.
Instead of focusing on everything that can go wrong, start focusing on everything that can go right.
What you focus on, often becomes reality.
7. Practice Gratitude.
When you practice gratitude, fear disappears and abundance appears.
It's important to think about all the things you have to be grateful for, instead of what you don't have.
Stop approaching life with a negative mindset, and things will change.
8. Learn to Visualize
When you visualize something over and over again, your mind begins to believe that it has already happened.
When the situation finally arises, your brain thinks, "I got this!"
Remember that you get what you focus on.
9. Stick with Healthy Habits
Stop eating junk food, cut down time spent on social media for the sake of entertainment, use social media to acquire knowledge, increase smartness level.
Quit extensive hours of gaming.
Stop watching porn.
Quit recreational drugs.
Although they may seem harmless at the time, your bad habits have immense effects on your confidence and mental health.
--post lifted from The Male Architect in Twitter, with some added insights from bmvd