To forego opportunities due to fear of failure or commitment is to miss out on some absolutely amazing experiences in life(and some heartbreaking ones).
Marrying somebody means inviting a third party, the State, in private affairs. Now, marriage can be convenient or recommended for religious and tax affairs, particular convictions, and for the protection of kids (then...).
But getting married to learn about yourself and your partner by, in essence, inviting a third party that in typical fashion would obfuscate instead of giving light, reminds me of the guy who wanted to be kicked in the genitals so that he could feel something brand new that day.
Only difference is taxes and rights to decide if someone is incapable.
Relationship wise nothing changed. Children however change a lot.
I would think that marriage rates would drop rock bottom if the incentives are removed.
Do you really think by not being married the State isn't in your affairs? Now THAT is a bizarre statement.
If it were a "romantic way of expressing one's commitment to another person," it would be enough to throw a party with friends, read a couple of fashionable poems, sign a guest book instead of an official register, and not invite the State into private affairs.
I really hope your whole life isn't centered around the failures of your parents. Then again...sounds like you might be a good candidate to forego the whole marriage and/or relationship thing.