How can I become more confident?

The easy answer is fake it 'til you make it. Believe it or not, simply acting confident will make you feel more confident. Go spend some time studying body language, specifically the body language of those people who are confident, who are dominant in social situations. Then spend some time in front of a mirror, and hold your body in a confident way. Practice walking with confidence. Make a conscious effort at all times to be confident in your body language. Before long, you'll find that people react to you better, and that will help you build actual confidence.

Just be u. Don't compare someone to u. Cuz everyone different. Don't listen to what people have say. Jus believe in yourself.

Believe in and love yourself first. Read headlines and articles on news websites which usually include various categories like health, entertainment, technology etc to keep up with what's going on in the world. Just doing that will help conversing with people and where you can form your own opinions on topics rather than follow other people's opinions. You didn't specify what you mean, perhaps you mean in starting a romantic relationship.