Can I be sued even if a contract was signed

Assuming that you do form an LLC as you indicate and you only sign agreements/contracts with the customers in your capacity as a member (that's what you call an owner) of the LLC and/or as manager or officer of it (i.e. always sign using your title and indicating you are signing for the LLC), you will NOT be liable for any claims or lawsuits against the company, and so the person suing cannot reach your retirement account and/or house.
There is an exception: if you *personally* did something careless, you could be sued for your own carelessness--and not as owner or employee of the LLC. Example: you are driving the van delivering the bounce house and in the process back into someone's car or hit a person. You could be sued as the careless driver, even though you would not be sued as the company owner. Say instead that you have an employee driving the van dropping off the bounce house and he has an accident: he could personally be sued, as the careless driver; the LLC could be sued, as his employer; the LLC could also be sued as the van owner (important: have our hypothetical van or any other vehicles/equipment be owned by the company, not by you personally, so you are not connected to accidents or injuries involving those things through being their owner); but you would be personally protected from liability, because being owner of an LLC does not by itself make you liable.