Your job scope hinted neither anything mechanical nor engineering. If your Diploma result is not too bad, why not try to go for another job? It's painful to work a job where you wake up questioning yourself every morning. Your job scope doesn't add to your CV in the future as well. Better to leave early and work at someplace with relevance than to waste your time in this hell hole of yours.

If you can't find a redeeming point then why bother?