No you have to file your own return for it. Where did you see about under 8,000? There's nothing about 8,000.
To file a separate return as a dependent you need to set up a new account separate from your parents. Online is only good for one return per account. You can use the same email address for 5 accounts.
Https://ttlc.intuit.com/questions/1894512-how-do-i-start-another-return-in-turbotax-online
Be sure on your return you check the box that says you can be claimed on someone else’s return. If your only income is W2 and under 12,400 you do not have to file a return except to get back any withholding taken out.
Filing requirements for a dependent
https://ttlc.intuit.com/community/children-dependents/help/do-i-need-to-file-my-own-taxes-if-i-m-a-d...
