When Sylvia Plath was attending Smith College in the 1950s and writing furiously in her journals about the kind of life (writing life, to be very specific) that she wanted for herself, she was absolutely determined to better herself. The entries are filled with orders to herself (“I will learn shorthand”, “I will begin reading Joyce”) and plenty of self-criticism.
At the same time, she is also trying to give herself the courage to succeed. Part of that involved trying to overcome her fears. Which appear to be mostly the same as any other writer.
Along the way, she delivers this sharp little apercu:
Everything in life is writable about if you have the outgoing guts to do it, and the imagination to improvise.
The more commonly quoted part comes right after: “The worst enemy to creativity is self-doubt”. While this is certainly true, it does not have the same snap.
Anything can be written about. Just go out and do it. Take from life everything you can for material. But do not be afraid to make up whatever you have to.