What are my odds in blackjack with this trick?

What are my odds in blackjack with this trick?
Let’s say I bet $100 at blackjack and lose it the first round. The second round I bet $200 to make up for what I lost and still come out with $100 if I win. Let’s say I lost the second round too and the third round I bet $400 ($300 for what I lost and $100 to win some). Let’s say I keep doing this each round (betting what I lost from all previous rounds + 100) until I win. Aren’t odds that I would eventually win, especially within 5 rounds? Wouldn’t I always come out a winner of $100 and just stop once I win that amount?