short I: tie die drive size decide divide picnic thick fifty visit civil

long I: mine smile prize arrived blind wild child library

Am I right. Thank you

No.

The only short i's you have in the first list are:

the first i in divide
both i's in picnic
thick
fifty
both i's in visit and in civil

These are all long i's: tie, die, drive, size, and decide.

Your list of long i's is correct. :-)