I agree with genetic. Give it more time.
Depression just takes so much work.
Just a thought. How do you feel about getting a pet. Giving love is as getting it. You experience the same feeling. Plus you are making another creature happy and secure. Parakeets are wonderful pets and easy to take care of.
You might find volunteering helpful. Feeling worthlesss can be changed by consciously doing something worthwhile. There are so many places that need help and living things that need help.
I hope you feel better soon.
Don't give up OK?