I did not receive a Stimulus Check, and my parents did not receive a Stimulus Check for me.

For the third stimulus payment, if you don't get it in 2021, you'll be able to claim a credit on your 2021 income tax return, if you qualify for the stimulus.

For the first and second stimulus payments:

If you're not a dependent, file a tax return and claim the Recovery Rebate Credit, if you qualify for the first and second stimulus payment(s).. If you filed and you didn't claim the Recovery Rebate Credit and you're eligible, amend your income tax return. 

Wait for the IRS to process their original return before sending in the amended return.

• See How to amend (change or correct) a return you already filed?
• To claim the credit, see How do I claim the Recovery Rebate Credit in TurboTax?

If you're a dependent on your parents income tax return and they didn't get the stimulus payment for you, they could claim a Recovery Rebate Credit, if they qualify.  

If they already filed and the IRS accepted their income tax return, they'll  need to amend their income tax return(s).

Wait for the IRS to process their original return before sending in the amended return.

• See How to amend (change or correct) a return you already filed?
• To claim the credit, see How do I claim the Recovery Rebate Credit in TurboTax?

To be eligible for the first stimulus payment: Generally, if you are a U.S. citizen or U.S. resident alien, you will receive an Economic Impact Payment of $1,200  ($2,400  for a joint return) if you (and your spouse if filing a joint return)  are not a dependent of another taxpayer and have a Social Security number valid for employment and your adjusted gross income (AGI) does not exceed:

• $150,000  if married and filing a joint return
• $112,500 if filing as  head of household or
• $75,000  for eligible individuals using any other filing status
  Your payment will be reduced by 5% of  the amount by which your AGI exceeds the applicable threshold above.

You are not eligible for a payment if any of the following apply to you:

• You may be claimed as a dependent on another taxpayer’s return (for example, a child or student who may be claimed on a parent’s return or a dependent parent who may be claimed on an adult child’s return).
• You do not have a Social Security number that is valid for employment.
• You are a nonresident alien.
  The following are also not eligible: a deceased individual or an estate or trust.

To be eligible for the second stimulus payment, your adjusted gross income (AGI) is below,

• $75,000 for individuals
• $112,500 for heads of household
• $150,000 for married, joint filers

You should receive $600 per individual plus $600 per qualifying child.