I have this friend who "can't" or "doesn't" do so many things I sometimes wonder how she gets out of bed in the morning. She's a writer, but she "can't" write a synopsis because it's not how she writes and she's a reader but she "can't" read dark thrillers because she's too happy of a person, and she's a foodie but she "doesn't" eat curry (which by the way is a fancy term for a blend of spices).
Ultimately what this friend is saying is that she's afraid. She's afraid to try new things or re-explore areas that might not have worked all that well for her in the past. She's afraid of failing or of not liking something, so afraid that she's "can't"-ed herself into a box. Her world has become increasingly smaller because of all of the things she "can't" or "doesn't" do. It's frustrating and sad because this same friend will complain about how hard it is to get published or find new restaurants or discover great books, but when offered suggestions, before trying, she comes up with a list of excuses why she can't.
I firmly believe that the only limitations we have in this world are those we make for ourselves. You want to climb Mt. Everest? What's stopping you? No, really? What's stopping you? You want to write a great novel? What's stopping you?
To break free and find great success you need to break free of the limitations you place on yourself. There are enough people in this world trying to tell you what you can't do, why are you doing it to yourself?