As you have lost your father you are feeling like this.
Dont worry this happens with every one when we loose our near and dear one. but we have to think about our future and remember the morals taught by parents to come up in life. So you need to forget the sad moment and try to come out of it. Start going to school as you need to become well educated and settled in future which might be yours fathers dream also.
daily this stabilizes your mind and increses your concentration.
you are young ,be bold and courageous. always think positive and work hard surely you will be on top one day.all you need is will power and determination.