Yep
It is possible, but very difficult if you limit yourself to just blackjack.
"Because I have had some bad runs."
It's called standard deviation. And it's expected along the way. That's the reason you need a large bankroll compared to your unit size. All the good books will stress this.
I Suggest you read and fully digest the following, in no particular order: Blackbelt in Blackjack by Snyder, Blackjack Wisdom by Snyder, Professional BJ by Wong, Blackjack Attack by Schlesinger, Blackjack for Blood by Carlson, 100 Proof Blackjack by Bootlegger is also good.
And as PM suggested: "Don't give up your day job". At least not yet.
Hope I didn't piss off anyone!
JB