With your train of thought, you have it all wrong, all, all wrong.
Skip to the chase. Don't bother getting married. No one is forcing you, are they?
Also, a wedding invitation is not a summons to appear. You can RSVP with regrets and not attend any of the wedding festivities. Wedding gifts are not mandatory, by the way. And, neither is your presence/presents at any of the wedding events prior to the wedding day.