Hey, I totally understand your concern. During my first two years of undergrad my marks were all over the map and my GPA was in the low 70's. I also had 60's in a few of the pre-reqs (Chem 1 and 2, Physics 1 and 2, and Physical Chemistry). I honestly didn't think I'd have a chance. I knew applying in 2nd and 3rd year was out of the question at that point so I committed to finishing my degree and doing the very best I could in my remaining two years.
After second year I gave it my all and focused on taking courses I knew I could do well in as I had finished most of the pre-reqs at that point. I was able to boost my GPA to ~80 and keep my grades in the high 80's/low 90's. Although my 1st and 2nd year grades were terrible, the quick turnaround of my 3rd and 4th year grades allowed the admissions committee to see my dedication and perseverance, and most importantly, that I am academically capable. My advise to you would be to finish your degree and focus on courses that will allow you to increase your GPA. This is very achievable as you have two more years! You could also re-take the pre-reqs you received under a 60 in as this might help eliminate being red flagged (I think having 50's in the pre-reqs is an automatic red flag, but I don't think 60's matter so much). Don't rush into the application process, there is no deadline. This will also give you more time to study for the PCAT, volunteer/shadow, and build strong study skills that will be extremely important come pharmacy school. Don't give up, it's way too early to call it quits. You can totally do it, you just need to re-evaluate your plan and believe you can do it!