Hello I made a mistake and put I was a dependent on my taxes but no one actually claimed me on theirs will I still get a stimulus check?

No you have to amend and mail in a 1040X with dependent unchecked.

 

If you qualify to be a dependent, you can't claim the stimulus, even if nobody claims you. If you are not, you can amend. You will have to mail your return. Qualifying child

 

Taxpayers likely won't qualify for an Economic Impact Payment if any of the following apply:

• Your adjusted gross income is greater than
  • $99,000 if your filing status was single or married filing separately
  • $136,500 for head of household
  • $198,000 if your filing status was married filing jointly
• You can be claimed as a dependent on someone else’s return. For example, this would include a child, student or older dependent who can be claimed on a parent’s return.
• You do not have a valid Social Security number.
• You are a nonresident alien.
• You filed Form 1040-NR or Form 1040NR-EZ, Form 1040-PR or Form 1040-SS for 2019.

 

If a child can be claimed, even if they are not actually claimed, they don't qualify.  However, if in 2020 they do qualify as an independent, then they should get a credit in 2021 (for the full $1200).