How Do I Transmigrate to a Sci-Fi World? I Have to Scavenge

Xiao Yun transmigrated, but why is it that everyone else transmigrates as a rich heir or an unrivaled genius, while she ends up having to survive by scavenging through garbage? And why has her gender changed too?

What? You want to know about the System? Xiao Yun does have a System, except...

When Xiao Yun finishes reading the Complete Guide to Basic Mecha Materials she found in a junkyard, the System's reward is:

"Congratulations, Host, on finishing the entire Complete Guide to Basic Mecha Materials. Your reward is the complete set of materials for the Complete Guide to Basic Mecha Materials."

When Xiao Yun finally manages to gather all the materials in the junkyard and builds her very first mecha, the System's reward is:

"Congratulations, Host, on successfully building your first mecha. Your reward is the Basic Guide to Mecha Construction."

When Xiao Yun pilots her mecha and barely manages to kill a star beast after it nearly tears her and her mecha to shreds, the System's reward is:

"Congratulations, Host, on successfully killing your first star beast. Your reward is the Basic Guide to Mecha Operation."