Focus
Borealis:
The ultimate mission or purpose that flows from youth is to learn. And, experience is the best teacher. Even though ALL of us can tell you (from our own experiences from which we learned) that time heals all wounds, you won't truly understand until you go through the healing process all on your own.
You are going through what EVERYONE has gone through at one time or another--the illness of a close family member; the overwhelming feeling of responsibilities; the break-up of a relationship; and the loss of an opportunity.
Eventually, you come to understand that declining health, illness, and death are all a part of the life process. No one can escape death. It might be difficult for YOU because your grandfather might be going through a "critical state," but you cannot change the inevitable. You are learning your coping skills and developing empathy and compassion. The key is not to lament the inevitable, but to embrace what good moments you will have with your grandfather in the present and to offer him your "labor of love" to make things more pleasant or comfortable for him whenever possible.
Even though your relationship of three years has ended, when one door closes--another opens. The lessons you will learn in your relationships will help you in the future (if you're willing to heed the lessons and grow as a human being). You will probably go through series of boyfriend/girlfriend relationships before you finally find the person who is the best fit for you. Everything you have learned from your past relationships will give you the tools, knowledge, and insight that is necessary to form a successful, happy relationship.
Perhaps you messed up your present opportunity to go to college; but the doors to a college education are not locked. The only things that would prevent you from getting an education would be your own lack of will and tenacity. If you truly want an education, you will find a way to get it. You need to muster the determination to endeavor and achieve worthy goals. But it isn't necessarily achieving the goal that's so important--it's the journey (the life that happens--and even the obstacles that you overcome) along the way that you might find to be the most fullfilling.
Life is not a melodrama unless you love drama. Take care, young person, and get busy living (and learning) rather than lamenting.