I hold no specific animosity against BU. I’ve got no dog in this fight, I’m trying to help you and answer your original query:
I’ve been a person who’s been set to enter medical school so if anyone can give me statements as to what I am getting myself into? I want to be on track for pre-med and I don’t want CGS holding me back, if that makes sense?
CGS seems a better set up for non STEM or non sequential majors. It fulfills a lot of general education courses but not premed pre-reqs.
So, to answer your original question, CGS would be holding you back. CGS has has extensive advising but the program doesn’t seem geared toward premeds, who need to take a sequence of specific classes in addition to their major pre-reqs and gen eds. Now current student tell you otherwise, but I fail to see how it’s possible since so few of the available classes match what you’re supposed to take. Did they tell you general “it won’t hold you back” or did they explain how it’d work? You don’t have to answer but you need to have the exact 4-year path where you fit in your major and the premed pre-reqs (your gen eds will be taken care of by CGS): calculus, biostats, General Bio 1&2, General Chem 1&2 with lab, Orgo 1&2, Biochem, Physics 1&2, Psychology, Sociology. I suppose you could fit Bio&Chem during your 2nd year along with 1-2 courses specifically for your major, assuming some overlap (you’ll need to consult with your adviser to switch the 2nd CGS science class because it doesn’t fulfill the premed pre-reqs); then, junior year, Calc, Biostats, Orgo; senior year biochem, Physics, Psychology; CGS SS103-104 will cover the sociology requirement. Then MCAT in June Senior year, glide year. But it’s very tight and doesn’t leave much space for your major or for advanced science courses. The pathways recommend taking Calc1 (if you don’t have credit already) and General Chem during the gap semester in order to stay on track.
I asked about “why BU” to understand. BTW it’s a question I ask most students who got into a college because it’s useful for current juniors contemplating the school and seniors with the same choices. I wish I understood better why you like BU.
I asked about your gap semester because… if you read other threads, you’ll see it’s the most common question about it 
It exists at Cornell, USC, Colby, NYU, Marist, Middlebury… and it is strongly considered ill-advised for premeds. However some students have specific activities in mind already that may make the gap semester fruitful or even helpful toward their goals.
I’m not sure where I have doubted your acceptance to the school. If I gave you that impression, I’m sorry. It isn’t my intention. You got into three top colleges and can legitimately congratulate yourself. Now you will make a choice between three strong universities.
Deciding is difficult. The main criteria for premeds are 1° being top 25% 2° cost 3° quality.
This thread may interest you also if you haven’t read it already.