How to manage difficulty facing public and lack confidence?

Hello doctor,

I am 21 years old and completed my graduation. I have a problem facing the public like the people who know me and who do not know me. I do not have any confidence in facing the public . As I am a tall person with 6'4" height I feel very unique with the way others see me. This problem has started from around five years slowly and I think I am in its peak stage. I always have run away from facing people who know me. I feel that others think I am somewhat inappropriate. If there is any function in around my house, I used to skip from those by making excuses so that I do not have to face people. I have some friends from school but they are not in town, so most of the time I sit alone. I wanted to be like other boys of my age, mingling with public and doing all the things they do. I also have the problem of hyperhidrosis which increases the lack of confidence level. Day by day I think this problem is becoming worse. I feel like others are laughing at my appearance and attitude. Please advice me about this situation because I cannot afford to go to psychiatrist personally. Please help me.