avoiding

how do you avoid the trap of... -losing to a defender and thinking you need a faster/harder setup -losing to a player with much slower setup than you and thinking you need slower setup all these will take you the ej path. how do you avoid? feel free to add any other trap you experienced.

Can someone here share some tips to avoid injuries? also some common mannerisms and misconception that can endanger the well being of many table tennis players out there :D i have no knowledge of these but i know that having this here can help alot so please help me out :)