Struggling with Medication and Finding Happiness

I have a very hard time taking pills. I had a tiny bit more luck with those that I can get the powder out of to put in food. I did have issues with that, though. I need help figuring out what may help me, though. I struggle to find happiness in anything but a romantic relationship. I have some things I enjoy, but barely. I'm in therapy, but it's mostly talk. Possibly DBT or stuff, but I'm not sure. I don't know what to do anymore. I feel like it's my fault I can't keep a relationship. I want to get better so I can be better in a relationship and actually feel happiness with other things, too. Does anyone know anything?