I filed my taxes on 02/18/2021 with three dependents and I still have not received my taxes... Has anyone else experienced this?

You have plenty of company.  The IRS is seriously backlogged due to all the extra stimulus filings, as well as a few million unprocessed 2019 returns left over from the COVID shutdown.  In addition, the Where's My Refund site has been erratic and unreliable.  But if TT told you the IRS Accepted your filing for processing, then the government has it.  (Approved is a later step, but TT receives no further updates once Accepted.)  Contacting the IRS will not help, and the IRS has implored taxpayers not to call them.  Lots of other folks are still waiting, so please continue to be patient.  Also see:

Refunds | Internal Revenue Service (irs.gov)

The IRS is under serious stress — what does that mean for your refund? (msn.com)

What led to IRS backlog: ‘Thin workforce,’ new pandemic relief programs | Federal News Network