don't think much....go to your mother and tell her; mom my exams didn't go well as I thought. please forgive me this time......i wl do better in the next exam. she wl forgive you.... don't worry.... parents are worried about our future only.... they want us to have success in everything..... specially in studies.....this is there love only.....and don't think that ur parents love you less than ur sister...they love everyone equally.....i also used to think like this some yr before....but later on I found out that they love me a lot too. when I faced some serious problem my parents are nly there wid me and till now they are there with me. your parents also love you a lot. confess ur mistake,.... everything will be ok as u are admitting ur fault. but try to gud in ur next exam as it is beneficial for you only.