I'm envious and jealous of my close friend
Why are you jealous of your friend?
I feel inferior. She has nice things, and she is a nice person, no bad sides.
There is no need to be jealous of your friend. You should not compare yourself to your friend, everyone has different life experiences and does different things.
Nah! You're probably just jealous.
I have nothing to be jealous of. I am fine with my life experiences so far, and you should be to. There could be aspects of your life that are better than your friends, so there is nothing to be jealous about.