Does not feeling awe and fear during prayer, and feeling that one's intention in acts of worship is not purely for the sake of Allah, mean that Allah is angry or has not accepted repentance or has not decreed guidance?

Fear of repentance not being accepted and of showing off is a good thing, but it should not lead to despair of Allah's mercy. Rather, have a good opinion of your Lord, be hopeful of His grace, and confident in His forgiveness. Combine fear and hope in acts of obedience, and do not allow Satan to instill discouraging whispers. So, do not abandon obedience for fear of showing off, and do not despair of Allah's mercy. Strive in supplication that Allah may accept your repentance and guide you to His straight path.