Mr price money

Good Morning, Im 19 years old and decided I want to start creating credit on my name. I visited my bank and was declined a credit card and was told I need credit to open an account and was told to get a clothing account so I decided to come to Mr price as I shop a lot here to open up an account and I did it the first time online and was declined then went to Mr price to ask as to why I was declined and got the same feedback as the bank I don't have a credit score since then I've app**** and many different shops only to get the same result sorry you don't have credit... How does one start credit if everywhere he goes he gets declined because of not having credit makes no sense. Then app**** again after 30days and then was told I was under age but I don't understand how they get that as in my ID my age is given. Now I need to wait another 30 days to probably be declined again can someone please do a proper credit review for me as I would like to open an account. I am permanently employed and been working for a while I've also recently had a family member who has passed and have been receiving money monthly and will be for 12 years... So it's impossible for me to be declined but still I get declined