Tự hào vì những điểm mạnh của mình. Phấn đấu trở thành một người lạc quan. Chuẩn bị tâm thế. Ngừng so sánh bản thân với những người khác. Cố gắng loại trừ mọi nguồn tiêu cực nếu có thể.

Given the above summary, write a detailed text in English for it.
If you want to be self-confident, then the first thing you have to do is to think about all of the things you already have going for you. You may feel like there's nothing good about you, that you have no redeeming qualities, and that everyone around you is somehow better-looking and more impressive than you are. Well, all of that has to go out the window if you're determined to change! Make a list of all of the things you're good at, from being a good listener to having a great singing voice. These qualities may not mean much to you, but you have to think about the fact that you do have plenty of things to be proud of.  If you really like the list idea, then you can even keep the list handy. Add to it whenever you think, "Oh, right, there's something else I'm good at..." When you're feeling low or like you're not worth much, read it over and you'll feel better. Talk to a close friend about it. Ask your friend what he or she thinks your strengths are. Your friend may come up with something that you never even considered because it was right before your eyes! Of course, optimism, like Rome, cannot be built in a day, but that doesn't mean it's not worth it to start building a foundation of positive thinking and an expectation for the best. Optimism and confidence often go hand in hand, because people who are hopeful for the future and expect good things to happen tend to think that good things will happen to them if they go out into the world or just try hard enough. Practice monitoring your thoughts to see how many of them are negative, and work to counteract every negative thought with at least three positive ones. With enough hard work, you'll soon be able to see the world in a more favorable light. The next time you're with your friends, practice talking about the exciting things in your life or the things you have to look forward to, and you'll see that people will respond better to you, and that you'll find yourself in a better mood. Being prepared for any situation -- within reason -- can also help you...