Ah yes...by the third year of Uni I felt the same way that you do. Looking back now part of me wish I'd dropped out and done another more fulfilling course then, as by now I could well have a job I enjoy. However, I conned myself into thinking ''it'll be alright'' and continued on and completed my pre-reg. Now, I've been qualified for 1 year and have only worked as a pharmacist for about 3 months (1-3 days a week as a locum). Was it really worth it just for the £5050 (just done my tax return!) profits that I made over these 3 months. Probably not. Now I'm looking for some sort of science based job, which usually involves competing with biologists, chemists or health psychologists, who usually have more detailed knowledge within their field. It's hard getting a non-pharmacy job if you're a pharmacist. I'm trying, and determined to get there in the end.
But...for medicine...that's a different matter. Do your pre-reg. Get into medicine. Locum for one day a week to make £150-200 weekly so get you through the next 5 years. Plus the knowledge you gain if you do a hospital pre-reg will make you an ace for the first couple of years of the medicine degree.
Hope that helps.