PA28 PLT TAXIES ONTO OCCUPIED RWY BY MISTAKE THEN RECEIVES FURTHER CLRNC TO EXIT VIA A TXWY.

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I HAD JUST COMPUTED A 4 HR XCOUNTRY; FLT AND HAD JUST LANDED. I LANDED ON RWY 22 WITH THE INTENTION OF TURNING OFF AT TXWY C. HOWEVER; TWR INSTRUCTED ME TO CONTINUE TAXIING DOWN RWY 22 AND TURN OFF ON RWY 14R. I WAS FAIRLY ANXIOUS TO GET OUT OF THE PLANE AND THE ONLY PART THAT REALLY STUCK IN MY HEAD WAS THE WORD 'RIGHT.' I LOOKED AT THE RWY MARKER SIGN AHEAD OF ME AND SAW 'RWY 32R/14L;' AND I JUST SPACED OUT FOR A SECOND AND TURNED R THERE AS I SWITCHED OVER TO GND AS TWR HAD INSTRUCTED. I WAS A LITTLE CONFUSED WHEN I SAW ANOTHER PLANE SITTING DOWN AT THE END OF THE RWY WAITING TO TKOF. GND TOLD ME THAT I TURNED ONTO RWY 14L INSTEAD OF RWY 14R AND TO JUST TURN ONTO TXWY B TO GET TO RWY 14R. I DID JUST THAT AND WAITED FOR THAT PLANE TO TAKE OFF BEFORE TWR CLRED ME BACK TO THE RAMP. I PERCEIVE THAT THIS HAPPENED BECAUSE I WAS TIRED AND ANXIOUS FOR THE FLT TO BE OVER. THANKFULLY NOTHING MORE THAN MY TURNING TOO SOON HAPPENED AND GND TOLD ME NOT TO WORRY; THAT IT WASN'T A PROB. NEXT TIME I WILL BE SURE TO KEEP MY WITS ABOUT ME UNTIL THE ENG IS SHUT DOWN.