Hello, Jiaying...

Here are some "J" names...

Jessica (a favorite of mine)
Jennifer
Jill (a kind of tomboyish name)
Juliette (a bit 'precious' but dramatic, if you're the dramatic type)
Jan (crisp, short for 'Janice,' friendly and also, coincidentally, the abbreviation for January, first month in the year on many calendars--and, since you're beginning with a new name, would be a symbol of sorts)

Just a few ideas. I hope you'll enjoy choosing your new name.

Best regards,
WW

PS: There's also 'Joyce,' which has the word 'joy' embedded in it--and 'joy' is very good feeling. However, I find the sound of 'Joyce' icy and cold for some subjective reason.

PPS: Well, then there's 'Joy' itself. Joy does mean very good feeling--elation, in fact. Joy might be a good possibility if you're looking for both the "J" and the good feeling associated with your own name.