Hey No Balk - You absolutely can still make your dreams happen. Just start right now to turn things around in the classroom.
You need to make a plan, so you have some direction on this.
I would start by figuring out this class credit issue. It doesnt' sound right to me, but there is lots of info I don't have and it is confusing. Start by going to the
www.eligibilitycenter.org and learning more about this. I don't think your school can add two partial core classes to make a random elective, for example. In terms of eligibility, HS students who have transferred need to submit official transcripts from BOTH (or all if more than 2) high schools. The Eligibility Center determines how the classes fulfill their requirements, not your HS. So, I would suggest youand your dad call the Eligibility Center and ask to speak with someone on this topic, so that your HS doesn't mis-handle your transcripts. If you can get someone from that Center on the phone or by email, they can also help guide you in terms of what you need to take over the next 2 years. They may say there are eligibility issues and that you would posiby have to red shirt but find out direct from the source (NCAA), not your HS.
At the same time, if you were my student, I would tell you to get your tail in to see your teachers during your free periods TOMORROW, and tell them you know you have slacked, and that you need to step it up. Let them help you with a plan to complete the year on a higher note. Use the peer tutors in your school also.
As far as baseball goes, you will get better info from others here, but I think that a two year school (JUCO) is a very strong route to consider. It makes sense for academic reasons, so that you can build the skills you need to be successful in an atheltic training program; so that you can do this while hopefully playing baseball if that works out; and so that you can start college at a reasonable price tag and not be too much of a burden on the family budget while you get the start you need. So begin to research some JUCos. In terms of admission many of them are open enrollment, so a dip in 10th grade classes won't be the end of the world.
Dn't rule out some of the less-selective 4 year colleges also.
FYI athletic training is one of the fastest growing fields, they expect 37% job growth in that field by 2018. You will want to really focus on your sciences and math in HS, and be certain you enjoy bio / chem/ physics/ anatomy. (Some of that you won't have until college....another good reason to start out at a Jr College to make sure you like and can handle the rigors of that core science work).
There are several paths to this career, but all require a min of a bachelors degree and a license. Most A Trainers have a master's degree, and some colleges have a 5 year MS/MS program. Others will take a bachelors degree in one of the core science areas then get a Masters Degree in A Training after.
FInd a program in your area and go on a tour, talk to the admissions people and learn more about the program to help you decide if this is what you truly want. Ask at the college, "can I start at a 2 year school and transfer in to this program?"
One last thought - maybe getting involved as a volunteer at a local hospital or rehab center to learn more about the field and to show colleges of your true interest. And talk to the trainers at your HS for info.
Good luck -