Since you are talking about BlackJack, I have had both good and bad experiences until I discovered or let’s say confirmed the fact that the casino has a house edge which means you will always lose against them in the long run. You may experience some profits at the very beginning when you start gambling but eventually the casino will beat you, and that’s what happening to you right now.
I can share how I approach this situation, sometimes I choose to take higher risks, for example, betting 5$ a hand at the beginning, so whenever I lose I double the bet to a maximum of 20$ a hand and whenever I win I return to the 5$ hand. When I get so lucky I could manage to bring sole profits back. However, Most of the time I stop playing when I breakeven or at least win few bucks, knowing that if I continue playing, I would lose eventually.
Another option is changing the game from BalckJack to poker or even slots, But keep in mind that the chances of losing are way higher than winning anything, if you can’t afford your losses, it is better for you to stop gambling for some weeks or months.