I loved the sciences and wanted to do physics, chemistry and biology. However, I was told that if I didn't do maths, I wouldn't be able to handle the physics. Hence I did maths, physics and chemistry.

Well, the advice about maths was incorrect. I could have handled easily physics without doing maths A'level.

Is my life better or worse because I dropped biology for maths? It's no better or worse, just different. I've gained from doing maths but lost from not doing biology. The reverse would have been true if I had swapped the subjects.

I agree with Big Dave regarding biochemistry. If you lean towards physics/chemistry, what makes you think you would you like to do biochemistry? I'm not criticising, just trying to understand your thought process.

I believe you should choose the subjects that interest you the most.