it's not too late to go to the college, find your course tutor (you were accepted onto a course iirc) and explain THE TRUTH. Being that you haven't studied for years, you find big groups of new people inimidating etc, and so you just bottled it, then the next day you feared the repercussions of not turning up, and this compounded every day...
your tutor will want you on the course, they know you are capable of doing the course, and the college gets funduing for students enrolled, attaining students, and students attendance figures.
Don't make up some bulshit about a dying relative, your tutor will know tis is a lie, and even though they'll STILL want and let you back on the course, you'll never have a good relationship as you'll both know about the big bullshit at the start, and deep-down, you know that your tutor will be well aware of the truth.