How come if me and my friend same weight drink the same amount of beer in a night i'm feeling sick to my stomach and dizzy all day and can't get out of bed until the next day but he gets up no problem?

An individuals response to a toxic ingestion like ethanol will vary with their genetic differences. Some have a metabolic system the easily de-toxifies the drug while others have a less efficient system. If all were equal the weight similarity would make the effect the same. If you drink, it is important for you to learn how to pace yourself within your tolerances.

Consider it a blessing that you can not tolerate alcohol. Alcohol is a poison that never did anybody any good, ever, so stay away from it. It will destroy your brain cells, damage testicular cells that make testosterone, facilitate development of cancer in many organs, cause hepatitis, cirrhosis and pancreatitis etc. There is no safe level of alcohol intake. Quit while you are ahead.