Ordering online

I just ordered something online for the very first time (ebay) and I'm so super nervous! What if my card information gets stolen? I canceled the order because I accidentally fucked up the address, what if I can't get my money back?? What if I did something wrong and the seller blocks me because I'm throwing up red flags or something and I can't buy the thing I wanted? What if I need that money later? I know these are all like super irrational and I'm way overreacting but aaaaaaaaaaaaaa I hate anxiety so much >:(