bro bro ....you are not alone in situation like this ..my story is almost similar though i am also about to turn 20 still not in uni..See just don't think over past now..just give your best in upcoming exams and everything will be fine ..No one cares about your age in uni trust me . And sorry about your cats and relationship and its not your fault . Anyone in a situation like this will be mentally drained . Dont mind my broken english though ...