Wow...jumping to way too many conclusions here, I think.
How can you love to do something but be bored doing it? It sounds like you need to reevaluate what you're doing. The road to med school is paved with a ton of useless nonsense that you have to plow through, so if the boredom is getting to you now, in your freshman year of college, you need to think very hard about whether you want to put in 3.5 more years of said boredom and then add crushing stress to that boredom for 2 years after that.
Yet you admit the boredom is present. I do not hate biology, chemistry, or physics...in fact, I find them interesting subjects with excellent applications to the real world. However, sometimes they get boring, and I can't help that. Actually being involved in clinical factors and volunteering are practically all I live for these days, because everything else is monotonous.
As far as I can tell, all the work doesn't really become "worth it' until your third year of med school when you finally get to set aside the sea of academic minutiae and focus on what you're actually trying to do for a living. Courses later on in college are more specialized and thus let you focus on your interests more, but they're still full of crappy rote memorization.
Rote memorization does bother me, as I prefer critical thinking, but I am not opposed to doing it. More specialized courses will probably solve my boredom problem, actually.
It sounds to me like your rationale for becoming a doctor is quite terrible. You can work hard at anything you do. Personally, I can't even begin to fathom intrinsically enjoying hard work, but what really blows my mind is working hard at something you hate just to do it. You want to earn the right to be a doctor? Great, but why? If the best answer you can come up with involves difficulty and hard work, it's time to change paths. You will be much more successful many years earlier in another field - a field you'll enjoy. There is no reason to keep struggling uphill against classes you're uninterested in, for it only gets substantially worse from where you are.
Ok...just because I enjoy hard work, doesn't mean I ONLY want to be a doctor because they work hard. Please stop making ridiculous assumptions. I have explored this profession up and down, and I know for a fact that something in the medical field will be my ultimate career path, be it medically-oriented research or actually becoming a physician.
Why is it so hard to believe that I intrinsically enjoy hard work? And again, I do not hate the classes! If I were aiming for a PhD in math, then yes, I'd hate the classes, but this feeling is different. It is just...boredom. I've already been through biology, chemistry, and physics on one level or another, and sometimes it just feels like I'm repeating and repeating and repeating the same information. I need variety.
I can't speak for the OP's situation, but I think he probably feels the same way. Learning something once is exciting and interesting, but going over it multiple times just to memorize it (and forget it sometime later) is tedious, yet needs to be done. At least it's nice to hear that the hard work pays off at some point.