Opinions on me getting a horse.. HELP PLEASE!?

If you have enough time to spend with the horse and can provide shelter, food and water for the horse than you could go ahead and get the horse. It sounds like (since you already have two horses) you can provide the basics of food, water and shelter but the big thing is (with you starting school and in sports) is time. It's up to you to decide whether the weekends would be enough time. Horses are social animals and need to bond with somebody.