At what point could investing in the stock market be seen as a starting gambling addiction?

This is more an Off My Chest.
I never was interested in gambling, and still there is no value in it to me. After spending some time on the stock market, I realised that:
1. It is possible to increase your wealth big time, and it's relatively very easy.
2. By doing research you are able to turn luck into your favour.
3. At the end of the day, the stock market is irrational at times.

Background story, I obtained 40% and lost exactly 40% in the span of a few months.
At what point could investing in the stock market be seen as a starting gambling addiction?
I feel like I want to increase my money again, and I saw multiple missed opportunities in which I would have succeeded in achieving this goal… at the same time I wish I never discovered Stocks. Working for a monthly payment which is technically possible by good investing in stocks makes me depressed. At the same time, I feel like money lost its face value to me, which made me take unnecessary risks. I feel like I am better off not touching the stock market anymore, but I feel like I cannot stop either since I had a lot of good picks previously…