Define overtraining, not DOMS or the like, but overtraining. That is one of those works that has been thrown around for a while now and used by those who don't really have a clear understanding of it. Overtraining is is at a different point for everyone, competitive lifters workout several times a day, every day with a couple days of rest thrown in. While I am sure I would come pretty close to killing myself at that level right now, given enough time I would be fine, and so would you. There is not a hard and fast rule when talking about overtraining, it's a sliding scale depending on your abilities.It's OK, you do you and I'll do me.
You do realize that injuries are often the result of overtraining though, right?
Injury is a result of doing improper exercises either with weight or form, and unbalanced workout. One of the main ones are shoulder issues. There are so many people that complain about shoulder issues and pain when benching. Mos ot the time that pain is caused because the shoulder is in a position of impingement caused by an imbalance of push pull exercises. What happens is the chest starts to pull the shoulder forward because there is not enough muscle tension from the back, creating an out of position issue for the joint, and bam pain. Injuries caused by overtraining are just about at the bottom of the list, as most people give up long before an OT condition affects them.
tl;dr: Sore muscles are not overtrained muscles.