Anxiety, intertwined with my depression, can make me impatient with others at times.

"Horrible" - no, objectively. Occasionally problematic or annoying - yes.

My MI issues
1) make me feel like a burden, and
2) definitely make me a burden to a small handful of others.
Depression is such an odd and many-sided illness. In my experience, being kinder to myself (insofar as I am able) has made me feel better, had no effect, and made me feel worse.