I hear that cannabis is being regulated in most of America and I can only wonder when we are going to get the same or close to it in the united kingdom. I have smoked for roughly 10 years "not every day but often. Why is it not legal or just de-criminalised already? Please help me understand why we are being deprived of a natural medicine. Thank you..

Regulated for medical use and being legal are different things entirely.
To some extent it is de-criminalised in the UK, but it's all related to your intent and quantities involved.

Where are you reading it is going to be legalized in "most" of the US? That is not correct.