When it comes right down to it, there are only two kinds of feelings: the love kind and the non-love kind. Love feelings, those like compassion, peace, wellbeing, and freedom, feel good. While non-love feelings, like anger, depression, grief, and jealousy feel bad.
Feelings are just energy. And only love energy can convert non-love energy. Every spiritual tradition says so. Quantum physics says so too.
So how do we love that which we don't find lovable - that which we typically try to suppress, deny, or analyze our way out of? By trying to force ourselves to be loving? By trying to convince ourselves that we love that which we do not? No. Anything forced speaks of effort and control. Effort and control are not love.
Sometimes the closest we can come to loving our negative feelings is simply allowing them to be there, acknowledging their presence. And if we find that too difficult, if self-judgement is in the way, we can simply notice it and make a space for that to be there too.
Perhaps, this won't fix our negative feelings right away. But, with practice, we can learn how to make a big enough, safe enough space to accommodate all the parts of ourselves. Doing so creates the optimum environment for their healing and deepens our capacity for self-love and compassion in the process.