[Solved] String Class

I use String Class in my arduino Skech... i read some advice to dont use it but if i good understand it, it shouldnt be used if skach absorb many off ram memory

now everything is working corectly when i compile it i get

Sketch uses 19786 bytes (69%) of program storage space. Maximum is 28672 bytes.
Global variables use 982 bytes (38%) of dynamic memory, leaving 1578 bytes for local variables. Maximum is 2560 bytes.

Should i be worried and try to change it? or it can run for a long time ?

You have plenty of program memory and data memory remaining, so there's no need to change anything if the sketch is working properly.

thx very much.