Medical school?

In order to get into medical school in the US, you will first need a bachelor’s degree from a good quality university, with grades of above a 3.3 – as high above a 3.3 as you can manage. You also have to complete certain pre-requisite coursework, which tends to be two years of chemistry, a year of physics, and a year of biology, all with lab. English (one year) and sometimes some math (calculus – one year, or calc and statistics – one semester each) are often additional requirements.

So considering all this, does this path sound realistic for you? If so, then you can pursue it.

If not, you could consider nursing. A BS-RN can lead to great things.

You may have an issue that you’re not aware of. Was your voc-tech school regionally accredited, or was it a career school? Depending on how your voc-tech school was accredited, those credits may not transfer to a bachelors degree school. If that’s the case, you may have to start from scratch – you’d want to talk to the university about this. But if that turns out to be true for you, you may want to look at associates degree nursing programs first, at local community colleges (which *are* appropriately accredited), and then later transfer to a BS-RN if you want to.

The person above me covered things pretty well, but I’ll just put what I would have said:

I think what people mean when they say an extra 2 years of school is that you need to get a bachelors degree on top of your associates degree. After that you’ll apply for med school and med school is another 4 years. After med school, you’ll have another period of residency training (at least 3 years, up to 8-9 years depending on your specialty). I only mention this because it sounds like the amount of schooling matters to you.
If this still sounds like something you want to do given the time commitment, you will have to make sure when you get back to school for a bachelors that you earn credits for math (up to calculus), biology, chemistry, organic chemistry, physics, etc. if you haven’t already done so. It sounds like you have enough clinical experience just being a medical assistant, but you can supplement that with research experience. Finally, you’ll need to get high grades in all your classes, especially the science ones. Depending on which medical school you want to make it to, you’ll want to get at least a 4.5. Better schools look for around 4.8. In addition, you’ll have to complete the MCAT test by the end of your second to last year getting your bachelors. This score is critical as well, and some schools won’t let you into an interview without a certain score. You applications need to be completed the summer before your last year, and you’ll need to write a personal statement as well as have several recommendation letters.
The path to becoming a medical doctor is not an easy one, but if you have the commitment and it looks like the right experience to confirm your passion, you will get a lot out of it. As the person said before me, you can also consider becoming a nurse (RN), which is considered pretty well paid, and it will be less schooling and not as hard to get in. Good luck.