Being a LEO is a tough career choice. My advice to you is stick with your education. Not just in criminal justice either. Think outside the box. My degree is in English and a few of my friends have degrees in business management. I can't express this enough.....STAY IN SCHOOL!
Becoming involved with a summer program will give you an idea on what the job will be like, but there is a lot more you won't see.
Being a cop is a thankless job (as you can tell by some of the responses). Working weekends and holidays, 24/7. You will see stuff that will turn you numb to people.
Keep an open mind and do your best. Don't get discouraged and never tell anyone that you can't do the job. An education will help you deal with what's to come.
Best of luck to you.