Denying the existence of a Higher Power is to deny you are the beneficiary of acts done on your behalf. The lives around you had a large part in your good fortune, and contributed through a force greater than you alone.
Accept this. Be grateful for what you have and how you got it. Others may have more than you, yet you still have a lot to appreciate. Don’t take all the credit, just as you can’t take credit for not being born into extreme poverty or left to die.