I have filled everything up at Feb 13 and still couldn’t get my tax refund. It is saying this process mostly taking up to 21 days. Does anyone has any idea what could be wrong with it?

You can track your return by checking the Where's My Refund website located here. 

If you elected to have your fees deducted from your refund, the IRS will send your return to Santa Barbara Bank, where they will deduct the fees and then deposit any remaining refund into your account. 

You can track your refund at the Santa Barbara website by clicking here. 

You can contact the IRS by following the instructions here, they can provide you with an update as well. 

When will you get your refund,
https://ttlc.intuit.com/community/refund-status/help/when-will-i-get-my-irs-tax-refund/01/25589

Was your return Accepted? First double check your efile status here
https://turbotax.intuit.com/tax-tools/efile-status-lookup/

When you efile you get back 2 emails. The first email only confirms the transmission. The second email says if the IRS (or state) Accepted or Rejected your efile.

Then only the IRS can tell you. IRS Where's my refund https://www.irs.gov/refunds/
Make sure you are using the refund amount from your actual federal tax return and not the combined amount Turbo Tax showed you at the end. That was for federal and state combined.

When you log into your account you should also see the status and if it was Accepted or Rejected, Started, Printed, Ready to Mail, etc.  what does it say?