The Redditors you talked to don't know what they're talking about. First of all, drug trafficking = selling drugs. The amount you ordered is not large enough to be considered selling.
I've been ordering meds online for 10 years, and I've spoken to people who have been doing it for 25 years, since the beginning of the internet. If customs seizes a package with a small amount (personal amount) of non-Schedule I drugs, they just keep it. Sometimes they send a letter saying, "You've been very very bad. No presents for you this Christmas."
By the way, it's not illegal to receive drugs in the mail. The reason why is because if it was illegal, someone who doesn't like you could mail you 100 kilograms of heroin and get you arrested. The authorities need to prove that you intended to receive it, which requires an investigation. They're not going to waste time and money investigating someone who ordered a personal amount.