IANAL, but signing contracts in bad faith may under some circumstances be tortious. Your corporate liability shield probably does not protect you from tort claims.

You are shielded far more by your lack of meaningful assets. You aren't worth anything to sue. But there are clients, I promise you, who will turn out to be vindictive.

Incidentally, if you're 22 years old, you should still have an LLC.

Nowadays a lot of companies try to add clauses that pierce the corporate veil (for example, having personal guarantees)

For all kinds of things, like leases and such were the company is too young to have any credit. But a personal guarantee on delivering a website on time would be a bit much.

For longer projects, you should be asking for some sort of upfront payment (to avoid being screwed over -- i learned that the hard way).

In that circumstance, companies may demand some sort of clawback if benchmarks aren't met.

bankruptcy (at least here in England) means you're royally fucked, especially at 22.

In the U.S. it depends somewhat; if you have a place to rent (e.g. know your landlord or it's via a friend) it's not a huge deal. You won't get a mortgage, and it'll make getting new credit cards or rentals from strangers harder, but not life-ending. Especially if you have a glamorous story behind it, like going bankrupt due to your tech startup being sued into oblivion...