Get to know other aspects of yourself beside what is "wrong" with you; not everything is bad/wrong with you, there are good parts too (honesty, willingness to try/persistence, logical, etc.) and support yourself when you perceive hard times in therapy. But the therapist is not there to bring you down but to support you when it gets difficult. Think of therapy in different ways (like a school course, for example, with difficult concepts/studying/tests).

And one can use other people/friends even though it's not therapy related; if you have a friend who has a good sense of humor, when things get scary or down, go hang out with that friend and laugh a little, etc. If you feel alone, go watch events that are similar to those you like to participate in yourself and feel one of the crowd, understanding the event better than others who have no connection to it? There are lots of ways to garner support and, nothing will happen in therapy all at once, you can build up to things and get support in place as you work, understanding even better what you will need because you will be participating in it at the time.

One chews and swallows one small mouthful at a time, not whole meals