DOES MY CUT LOOK INFECTED? IS IT NECESSARY TO SEE A DR. ABOUT IT?

ABOUT 3 DAYS AGO, I GOT UPSET SO I CUT MYSELF ON MY THIGH, AND ITS ALMOST 3 INCHES IN LENGTH. I USED A RAZOR BLADE. I KNOW CUTTING ITSNT HEALTHY TO DO, PLEASE DONT JUDGE ME! THAANKS...INITIALLY, IT BLED A LOOT. TODAY, I NOTICED THAT THERE WAS A BIT OF DRAINAGE AROUND THE WOUND. IS IT INFECTED? SHOULD I GET IT LOOKED AT BY A DOCTOR?? WHAT CAN I DO TO TREAT IT??