If you lack a college degree and/or some sort of marketable job skills, you're probably going to find life frustrating, prospects few, work conditions hard, hours long, and wages low. If your Japanese skills are lacking, all the more so.
How are your Japanese skills (including reading/writing) and what sort of specific marketable job skills and/or qualifications/certifications do you have?
Young men who come to Japan unprepared to make a life here (education, job skills, language ability....earning potential, basically) tend to be the most frustrated and to have relatively short stays.