I suppose I'll make a longer post to help you out.
Here's a few things I feel you should consider.
Why do I want to be a doctor?
To help people
If you truly care about helping people, become a scientist or even an engineer. As my lecturer said once, an oncologist can help 10 or so people in a day. A team of scientists can help a million people with what they achieve.
It's amazing to be saving people's lives
In theory, I would whole heartedly agree. But medicine is not really like what it is on American television. Most of the doctors I spoke to said they found their job to be mundane. It's extremely stressful as many people don't appreciate your work and it is very difficult to cope with people dying around you or you not being able to help people.
$$$, Chicks and Prestige
Not joking with this one, if these three were on the cards, it'd tempt me to do med personally but in reality, I just don't feel medicine offers these. I remember I was talking to my now ex-girlfriend and she said she actually found it unattractive that I would become a doctor as they seem stressed out and work all the time. Consistently, none of my none of my mates got with girls because they were in biomed. Prestige in medicine is lol-worthy, it's just not really there anymore. $$$ are great in medicine once you specialise, but overall, if you want $$$, go with engineering or dentistry. Money will be on you straight out of uni and it is very handsome indeed. Median salary for an electrical engineer before overtime with 10 years experience in Australia is: $170,000 AUD. With overtime it's 200k+ and everyone does overtime.
Lifelong learning
Let's get something straight, if you do medicine and want to do surgery for instance:
25: Graduate
28: You can apply to specialise (No-one will get into surgery this soon in reality, some people even do a PhD to become more competitive in their application)
34: Finish your specialty (Less then 30% of people pass final exams first time, in reality, you would finish your specialty training at about 40).
Training for a speciality is crazy hours. Your life is the hospital. My friend's brother (radiologist) said it broke him down many times and he felt like giving up many times as he failed some exams repeatedly.
Contrast that to an Engineer:
23: Graduate
23-??: Work
Engineers are literally the most vibrant people on campus, always at the pub and genuinely enjoy life. In biomed, I look around and legit half the cohort seems depressed.
Regardless, I can't make this decision for you. I would, however, advise the following. Go to a hospital, ask to speak to a few doctors (5+) about whether they regret choosing medicine, whether they enjoy their job and any other questions you have.
Now, Biomedicine V Science, I will give an objective analysis here:
Biomedicine
Pros:
-The people in your degree push you to insane levels. You got 24/25 on that mid-sem test? Cool, half your mates got 25. You miss a class? Cool, your friends ask you where you were. First day of first year, people already hitting the books in the library. So if you want a good GPA, Biomedicine will help you. Also, people are very friendly and it is very healthy competition. People actively form groups for revision and people go out of their way to help you out.
-It does give you a better idea of what medicine/health science is than what science does. I can't be bothered arguing this point, but it does.
Cons:
-You are limiting yourself from day one. People say there are a lot of options with a Biomedicine degree, I find that hard to believe. Almost all the options you have in a Biomedicine degree are there in science + there are more.
-People are slightly socially awkward and think they are better than science students, which is annoying. Science and Arts students regularly take the piss out of this for what it's worth.