Why I am always freeballing.

When I was 12. My dad brought underwear for me. Till then I haven't worn underwater. He gave it to me and told me to wear it. I worn it and stood before him only wearing it. He said to me that from now you have to wear it. But within an hour I feel very uncomfortable after wearing it. I got feeling that some one holding my waist very tight. I started feeling very uncomfortable. I removed it and put it in my drover without knowing my parents. Next day I took the underwear from drower and put it to wash and another underwear hide into my drover after taking shower. And this continues everyday. Now I am grown up and no need to hide the underwear. Rather I stay nude now in my separate room. But still I am wonder why we should wear a cloth under a cloth.