Oh Jesus. I'm not trying to flame you bro but this has train wreck written all over it. Let me list a few reasons why.
-you are 21
-high bf percentage
-5 week cycle of test or deca is pointless. It will only shut you down with little gains since it takes about 4 weeks to actually start producing gains.
-deca is very harsh and is awful for a first cycle. Prolactin induced gyno and major shutdown is a concern.
-you haven't planned a PCT.
-do you have an AI and ancillaries like caber or prami to combat estro and prolactin?
I would say stop now before it's too late and you are shutdown with no gains, gyno, and a limp dick.