Okay, you have the right reasons but you are lashing out in a wrong manner. Frankly speaking, I am against fornicating at a tender age of 17. No matter what any half-baked Sociologist or Psychologist states, ***'s primary function is procreation. If you cannot fend for your brood, you should stick it back in. It's just that simple.
Many teenagers these days don't know the gravity of the situation. Abortion is a delicate matter. Many families do not support it because it some how defiles the sanctity of life. There is no such thing as 100% fail-safe contraceptives. If a child is born, then he ends up in foster homes. I don't understand how people are so obsessed with *** and don't value this important factor it.
I would side with your parents on this front. 30 is extreme, but, you should abstain till you are able to care for yourself and earn to a degree that if such a thing occurs, you can at least provide for your family. Now, as far as college is concerned, then perhaps your parents do not have the money? Maybe you should have a talk. If they don't have the money, how can they send you to a good college?
What about you working part time to raise money for your own college tuition? There are several things to be considered here. Don't act so disrespectful.
I thought you liked me ...