Discontentment

I am asking for prayers to overcome discontentment. I thought I was thankful for everything God gave me in my life but now all I can see is how life has disappointed me, how what I do isn't enough, comparison to everyone else, and I'm not happy with what I have even though I know people are praying for things I have. I feel bad that my discontentment is impacting relationships that are dear to me.
Thank you!