I wake up with hand numbness,i have to shake them to be able to use them besides having pain in my upper left back,should i be worried?

Never should worry: Hand numbness at your tender young age could be several different things; none of which need cause you to worry but doing something about it is another story. My recommendation is for you to get a good musculoskeletal as well as neurological examination to determine what may be causing these annoying symptoms. Blood tests may be necessary. I'd try avoiding invasive tests right now if possible.

Don't lump, Jane: One of the most important skills a doctor must possess is knowing when to lump & when to split. It can be challenging because pts often split when they should lump & lump when they should split. In your case, splitting is appropriate. It sounds like you may well have carpal tunnel syndrome. Get it checked out. The back pain sounds unrelated.

Numbness: You may be laying on your hands. may try pillow supporot on lay on your back

Varies: There are a number of possibilities, I would not hesitate to be seen for a specific diagnosis. Numbness is a neurological symptom and a nerve conduction test can usually sort it out as well. The two most common causes are either a pinched nerve somewhere, with carpal tunnel syndrome being the most common that involves the thumb; or a neurological condition such as a neuropathy for example.