Spartans Don't Die, They Just Disappear

As an ordinary young man in the new era, I thought about graduating from college and becoming a civil servant and then starting to live an ordinary life. However, fate played a trick on me and I finally managed to survive until I finished college. I also became a member of the army of time-travelers. Others traveled through time like One Piece or Naruto, but what happened to me? This world I don't understand it at all, and people are either fully leveled or have a system. How can I turn from scratch into a newborn baby? This is too baby... After experiencing some things, I realized where I was. I thought about it, but can the reality really be what I want? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.