How can I protect myself from future disputes when making agreements involving shared property use with neighbors?

Why is there less scrutiny for military personnel wearing uniforms in public compared to other professions, and how does public perception play a role?
I was born on 18 November, 2007 and currently I'm 18. Sometimes I feel so frustrated about my life. I don't know what I'm doing. If you are older than me, can you give me any solution?