Joe,
Merry Christmas.
Everyone experiences mental blocks. Whether it's breaking par, breaking 30 at Oakmont, or breaking 80 for the first time, these forums are littered with people on the verge of... (I'm not calling your post "litter", just saying it's a common syndrome)
My guess is, once you break par, you will then do it with some regularity. Until then, there are some things you can do to help get over the hump.
Take a practice swing. This will help your game more than you think. Bring the club back like normal, but don't click it on the downswing. This gives your reflexes an immediate timing reference. If you take a practice swing, you will find yourself dinging the next swing a lot more often.
Play the course you like best until you break through. We all have courses we prefer. For me, it's Royal St. George's. Whatever course you feel most comfortable on will most likely be the course on which you break par first. Take some pressure off of yourself, you can challenge yourself on other courses once you've reached your milestone. I can't imagine how many Tour Masters reached Legend after a round at St. Andrews, but I'll bet it's a lot.
Add a foot to your putts. If you aim for a hole that's a foot further, you'll never come up short and that can be the difference between a 76 and a 72. If you end up a fo0t and a half past the hole or sitting on the lip, it's still a tap-in.
Equipment helps, and hurts. Any equipment change will require an adjustment period when you're not always sure what's going to happen after you hit. Equipment upgrades are great and make the game easier once you're used to the clubs, but a constantly revolving carousel of equipment changes will only serve to muddy the waters. Learn your putter, it will help. When you're used to it, move on to a different upgrade.
I have no doubt you'll break par soon. Good luck and let us know when you do.
(The practice swing advice is the best part of this reply).