Join Date: Sep 2012
Location: Central Western NSW, Australia
Definitely wait, or find a lease.
You want to have a ridiculous amount of knowledge of things that you'll probably never need to know before you get a horse. I'm 21, and currently have my 'second' horse, who is a free lease. I pay for absolutely everything - 3 bags of feed every fortnight, and extremely cheap agistment costs me around $200 a month. On top of that there's a farrier every 6 weeks ($80), he's steadily destroying his new rug, I've had to buy a new saddle and a riser pad ($100 for a cheap secondhand saddle, another $100 for the riser pad), I need new reins because the leather ones I have are going to break any day now ($30+)...
I have everything cheap, didn't even have to pay for the horse itself, and it's still keeping my bank account low. Unless your parents have extremely well paying jobs, it's not something you should expect them to do for you.
Also, med school is VERY demanding. Are you going to feel like getting up at dawn to check on and feed your horse, go off for a day of uni, and then come home to exercise and care for your horse, on top of probably working to pay for said horse?
Not to mention the fact that most 'beginner horses' that are cheap end up being unsound or drugged these days. If you are determined to have a horse, look for a part or full lease. It means that if things get too much, you don't have to worry about the fate of the horse (as much), because they have someone to go back to that can provide for them.