Alternative word for jealous (without the negative connotations)
I found 2 answers that worked for me.
"Aspire", as in "I aspire to have what you have".
Or "benign envy". They did a whole research paper on it! http://everydaylife.globalpost.com/not-jealous-others-success-13972.html
Wish may be the word you want.
I wish I had memories as nice as yours.