If that is indeed your name it is because you were given it. A most unfortunate choice by your parents. Firstly they forgot to capitalise it, which should be done as it is a proper noun. Secondly...
In Irish Junior isn't a given name, instead you take the fathers name and add óg, for example if the father's name is "Seán" then Juinior is Seán Óg.Another answer:I have heard "Sóisear" used...