You don't seem to have arrived at actual faith and realization to the level of certainty that Allah exists and that Judgement day will be coming for sure. Your faith seems to be hinged on what you should be doing.
You need to not only read Quran, but also go and study faith and Aqeedah to make your CONSCIOUS mind aware of the inevitability of judgement day and the wrath of God on those who commit all these horrid sins.
Read about the scientific miracles in the Quran, the recent updates that renders darwinian evolution impossible and solidified creation, the impossibility of existence without God's input through the balances in the universe and on Earth, the authenticated documents and physical relics left for us from the days of the prophet -pbuh-, and then read more details about God, the prophets, judgement day, heaven and Hell. Your perception will start shifting and you will find doubt no longer visiting as hard. It's a gradual process so give it time sister.
And May God grant you peace of mind and guidance