Well I completely cocked up the landing on my ME flight test. Slammed the damn thing into the runway so hard I taxied it straight to the hangar for the engineer to take a look at.
Don't worry about it is the best advice, but I can sympathise because I've been there. Getting really concerned that you can't do it, then you lose confidence in yourself and you get worse.... etc etc. Downward spiral.
Just think "f*ck it". What happens, happens. Give it your best shot- worse thing they can do is kill you. So you landed on the opposite direction runway?! (I presume this was an uncontrolled airfield). Temporary disorientation. Just resolve that, in future, you check the direction on the mag compass before you touch down. Or, when on downwind for 06, you're not flying a heading of 060.
If it's any consolation, I once nearly landed on 22 when I'd been cleared to land on 27 (at Vero Beach, FL, in 1997 after 60h or so of flying).