Questions about the Stimulus Check?

Hello,

          So I have been trying to figure out whether or not I am actually eligible for the current stimulus check that everyone around me seems to be getting. So, I filed my taxes for 2019 and I received my tax refund, yet, it seems that I am unable to get a stimulus check just because i marked the box that stated that I can be claimed as a dependent? Is that the reason? I also see that many websites and people are saying that people between the age of 17 - 24 are most likely  going to be ineligible, with that I am 20 years old.        I just don't understand this, everyone around me (people primarily around my age) are getting this and yet I go online to the IRS website to check and it seems that I am ineligible or something. I just don't know, but, for those who can shed some light on this for me, Thank you.