Am I pregnant? I'm only 18 years old...

Am I pregnant? I am 18 years old, and I was supposed to get my period 2 days ago. I have my whole life set out, college, a great job, and I'm in no place mentally or physically where I can have nor raise a baby. I've had tender breasts for the past two days, and very slight cramping, but I've noticed that I've had little to no discharge except occasionally a thick white, paste like dishcarge. No implantation bleeding whatsoever.