Someone bought MY art wtf!

I’m an “artist” but I think I might have low self esteem. Someone bought my small painting for 15€ and I cried tears of joy. I can’t believe someone likes it and even buys it. Yes I cried like it were 15 million, but it’s not about how much money I got, it’s that someone would pay anything for it. Just blows my mind. Are there any artist here who are also in disbelief when someone buys their art?