Hello.
You yourself have accepted that you didnt work hard, have been cheating earlier and now you have failed and are blaming Shani Dev for it.
Shani Dev is Planet known as karmfal data. Shani dev give results as per karma of person. Shani dev never harms a honest hardworking person.
In your Horoscope Shani Dev is joint with Rahu in 8th H. If you want to have a normal life without suffering, then only way is to work hard and achieve things by your merit and effort in right direction.
Shani dev is yog karaka planet for your horoscope.
It will give you good success if you work hard with honesty.
Stop blaming God. Its your own lack of efforts and hardwork which is to be blamed.
Regards