Stress problem. Problem and treatment!

Hello I face many problems nowadays 1 I am shy and introvert from childhood,I feel shy to talk with someone and don't like to go any other place and Town 2 I feel so nervous and don't want to go anywhere and before meet with new person 3 I feel stress in daily life but overthinking also and not feel negative daily 4 I feel stress and overthinking before going anywhere 5 Before COVID I go to many places and visit many places with family and also alone but after COVID feel same situation 6 I don't have bad habit of drinking and smoking 7 I don't feel negative,stress or in public places, gathering and parties 8 I don't want to meet new people whom I not met before 9 In one and half month I am going to married,so I want to take some treatment before it So tell me exact problem and treatment