Scared of my optimistic thoughts about the future

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So , more or less two or three months ago I discover that I really enjoy making videogames in a general manner , except programming , I ended with the conclusion of that I want to be a game director since I want to help in all departments , I already have three ideas for games and my plan it's to develop these ideas while I study to have a consistent game idea when I get to seek for a job.

The thing it's , what if anything of this really happens ?
What if it just ends being a dead dream ?
I need to get self confidence , but I can't get any , it doesn't matter where I look , it just looks like this is going to be , well , just a dream.
I'm specially scared of this since this dream it's the only thing that keeps me wanting to live , before discovering I didn't really had any real hobby's or anything that I wanted to dedicate my life in , and sincerely , I don't really want to work in a supermarket 9 hours per day.
I don't like saying this , but I really think this is the only thing that has make me happy since a really long time , so , /adv/ what I should to ? I should abandone this unrealistic dream ? I should try to get more confidence in myself ? If then , how ?