Do I need to amend my tax return if I put that someone can claim me as a dependent and later find out that they didnt qualify to claim me

It probably will not  have any effect on your refund or tax due.....if you need to amend, you do so by changing your answer in MY INFO to the question that asked if someone else could claim you as a dependent.  Click your name and go through the questions.

See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...

It could increase your Standard Deduction to 13,850 if you have less on line 12.  And you might qualify for the EIC Earned Income Credit.  And if you have investment income you won't need to pay the kidde tax.  You should amend to see if anything changed.