It is not easy when we don't like our own creations. Not every song starts out perfect, not every painting is a masterpiece, what they are is filled with love and care.
Make a list of the actual things you don't like and the things you like. Set aside the emotion of the piece and review it like someone else made it then decide if what you think is bad really is.
Many times a quilt doesn't like me but loves the person it was given to.