If your total income for the year, from all sources, was less than $400, and you did not receive advance premium tax credit for health insurance from the marketplace, then you do not have to file a tax return. If you had other income besides the $368.85 of self-employment income, and you file a tax return, you have to report all your income, including the self-employment income. When you file a tax return you have to include all your income, of any kind, no matter how little it is. If you do file a tax return because of other income, you will pay regular income tax on the self-employment income, but you will not have to pay self-employment tax, since the self-employment income is less than $400.
I'm not sure what you mean by filing two forms. You only file one tax return for the year. You have to include all your income on that one tax return. But Chaturbate and Lyft are two distinctly separate self-employment activities, so you should report them as two separate businesses. That means that there will be two Schedule C forms included in your one tax return for the year.
