I didn't work in 2020 but I had an income of
Bank interest $200
Stock dividend $100
Stock short term gain $8500
Total: $8800
I believe I don't need to pay any taxes but am I still required to file tax return?
You probably won't owe any tax, but you will probably need to file a tax return
What is your filing status - single, married, filing jointly, married filing separately, head of household - and can you be claimed by someone else as a dependent? The answers to these questions will help determine your filing requirements.
From the IRS: You must file a tax return for 2020 in any of the following circumstances if you're single, someone else can claim you as a dependent, and you're not age 65 or older or blind:
You can get a complete view of your filing requirements by using the IRS toll Do I Need to File a Tax Return?