Just wanted to let you know that I read your post, and I'm sorry to hear that you are struggling. I can definitely relate to not feeling like you have not achieved anything in your life, and that your potential is wasted. I feel a similar way (25 years old, part-time job at a fill crew position).

Although we may feel old, we still have plenty years of life left and can make big changes in ourselves. Personally, I'm paying off my college loans and then plan to attend college once I do. Have you thought about going back to school? Perhaps for something you actually enjoy?