Confidence comes from solving your own problems in life. Every time you overcome a challenge by yourself, you prove that you can handle difficult situations. This builds trust in your own abilities, and that trust is called confidence.
Always treat others with respect. Speak politely, listen carefully, and behave with kindness. If you realize you are wrong, admit it and be willing to learn instead of arguing. Respecting others also earns you respect in return. and if the time comes stand your grounds too
When you meet someone older or more experienced, don't feel intimidated. They deserve respect because of their experience, but they are still human, just like you. They have fears, dreams, made mistakes, and learned lessons, just as you are doing now.
Remember, confidence isn't about thinking you're better than others. It's about knowing that you're equal in human worth. Respect everyone, stand up for yourself when necessary, and never let anyone make you feel less than you are.
For example you are 20 rn and some random person is in 50-55 of age you both have same thoughts through out the day for example when you were 14 you like that girl in your class, and she goes out of the school the same 50age unc might like her too,.. you know..... they like em young these days (this was a joke im kidding)
Keep learning about the things that interest you. The more you know, the more valuable your conversations become. When someone talks to you, you'll be able to share useful ideas, interesting facts, and meaningful insights instead of just opinions.