I recently checked my decade old blockchain.info wallet, there my btc addy starts with '1Libert..", I dunno if I generated it using vanity address generator or was just a coincidence.
this will depend on the time your address was generated.... If it was before the vanity address generator existed then it may be a just be the standard btc addy (mind you vanity address generator started existing around 2011). on the other hand the standard btc address is just 34 characters long (no spaces). Also, It's worth noting that Bitcoin addresses are randomly generated, so it is possible to generate an address that appears to have a specific pattern purely by chance.