Suggest Treatment For Forgetfulness

Hi, I'm 22 years old. Im really forgetful at remembering things and was wondering if u can help me? I tend to forget given instructions, i cant follow simple instructions and i sometimes forget my keys. I also find it really hard 2 understand when reading things. How to I train my brain, in order to prevent this from happening as it really affects my self confidence and esteem. It has also made me really depressed.