How do I go about receiving my inheritance if I have to go to college?

Your grandparents have done what many other grandparents have done: put money aside for education. The best thing to do would be to contact the trustee of the trust fund to find out what the trustee would require in the way of documentation. Sometimes it might be a letter from the college in other cases the trustee might have to make tuition payments directly to the college. If there is no trust you should contact the personal representative of the estate (this would be the executor). In any event, the first thing you need to do is follow whatever direction the will or trust suggests.

Why is there any conflict between inheriting money and going to college?

You will need to talk to the lawyer who is handling the estate. I do not understand what the problem is with inheriting money and going to college. It sounds like the money may help you pay for college. There are so many colleges that you can find one suited to your exact interests, whether it is liberal arts, or science, or music or whatever it might be. I am trying to understand how inheriting a lot of money and going to college could be anything but good.

Going to college is irrelevant (unless you are currently a minor). The will needs to be offered for probate and the estate administered. Call a probate lawyer in your area.