First, learn to accept yourself.
Second, you should have confidence in yourself in the face of everything.
Third, we must have our own bottom line and learn to refuse.
Fourth, keep good relations with friends around you.
The difference in personality depends entirely on yourself. Nothing can't be changed. It depends entirely on your perseverance. Learn to accept yourself, because everyone is unique and unique. Each of us should look at ourselves correctly, seeing both our strengths and our weaknesses. Accept your imperfect self and cultivate yourself slowly. There are no perfect people in the world, and there are advantages and disadvantages. Accepting your imperfect self will make others accept you, and you can overcome cowardice and face it bravely.
The same cowardice can also be defeated and overcome by confidence. Confidence is very important in this world. If we lose confidence, it's like a car running out of gas. Facing anything, not daring to try and challenge will only make you more introverted and cowardly. Do everything with confidence, and slowly you will find that you are actually very strong, and you will not be defeated by cowardice, but will only go further and further.
Helping others is willing to help, not helping is a matter of course, learning to refuse others has its own bottom line. Not everyone can bully you, let alone touch your bottom line. Don't blindly accept others' help, don't make others feel weak, show your bottom line, truly strive for self-improvement, express yourself boldly and without affectation. Life won't treat you badly. Let others see your bright spot, and you will gradually become stronger and not so weak.
Keep friendly relations with friends around you, because they are assets around you. They will give you a sense of security and support you to do what you want to do but dare not. They may be your strong backing, so maintaining a good relationship will help you a lot. Don't make some unrealistic jokes with others, and don't use bad words to hurt people, so that you can learn more. Deal with it slowly and try slowly, and your cowardly and introverted personality will gradually leave you.