Although you may be terrified of putting yourself in social situations, you should seek out social situations. The more you avoid something, the more control it has over your mind. The anxiety around it will grow until it becomes something you fear. The more you get used to something, the less fear and control it has over you.  Try making spaces yours. Anything is nerve-wracking when it's unfamiliar. Go to a restaurant, a part of town, or your gym. Walk around. Become familiar with it. Once you start to become familiar with a place, it can feel more comfortable. Plus, you start to put your focus on your surroundings. Then you can start socializing with people. Take someone with you. You don't have to do this alone. Take a friend or family member to an event. Start small. Take a free class at a community center, go to a group class at the gym, volunteer, or join a meet up group and attend a gathering. Finding people with similar interests can help you interact with people. Clubs and groups may give you a smaller environment to socialize in, which may help your anxiety. This makes it easier to force yourself to talk, because you can't just get lost in the crowd. When you are in a social situation, try concentrating on the conversation instead of your own anxieties. This helps you connect with the other people, which is a good thing, and offers you opportunities to talk. When you start to worry about how you look to everyone else, pause and refocus on the present moment. Add comments and talk when it seems natural. Focus on the present, instead of replaying things that have already happened. When you are in a situation that causes you anxiety, try to hang in there. At first, the anxiety may feel unbearable, but anxiety gradually lessens the longer you are in a situation. Try to stay in the situation until your anxiety reduces by half. This may take up to half an hour, but oftentimes it lessens quickly. Some social situations are quick, like saying hello or making small talk. Although that may cause anxiety that...

TL;DR in Vietnamese:
Hòa nhập với xã hội nhiều hơn. Tìm một câu lạc bộ, tổ chức hoặc nhóm có liên quan đến một trong những sở thích và kỹ năng của bạn. Tập trung vào cuộc trò chuyện. Cố gắng kiên nhẫn. Quan sát và lắng nghe khi ở trong nhóm lớn. Nhớ rằng hầu hết mọi người đều không tập trung vào lỗi lầm của bạn. Trở nên thân thiện và tử tế.