Lord have mercy (which is a prayer, not a comment).
Welcome to CF. I hope you can find the help you need here.
There is much that needs to be said, but I think the most important is that yes, you have a very wrong idea of WHO God is. He did not create evil, He did not deliberately plant it. But He allowed the dignity of free will to us (because we are made in His image and He is free) and to His angels (some of which chose to oppose Him, and that is the beginning of evil).
God is love. He is not angry and looking to punish people. Many times Christians view the Bible as the Jews did without understanding really what Christ Himself taught and have various misconceptions about God. To be honest, I think these wrong ideas do great danger to many people and push them away. The only consolation is that the "god" they reject is not the real God anyway, so they may find His mercy in the end after all.
Sin and death ARE like a cancer or virus that have entered creation (which God's creation was "very good" and THAT is His desire - and at the end of this age He will make it so again).
Death wasn't a punishment, it was a consequence. Like if you shut yourself into a cabinet you can't see the light anymore. Adam and Eve cut themselves from communion with God, who is the source of life, so they began to die.
And sin, death, sickness, evil, poverty, hatred, and all the rest have happened as a result.
It is God's loving desire to draw all people back to Himself, to heal them, and to restore all.
I'm not sure where you got the idea that you should be happy just living and having only God, not food, health, and so on. There are some who practice acesticism (denying the flesh) who progress to such a point, but that's not something a person should just undertake and expect to happen. It is a high spiritual state and requires a LOT of foundation, can be done wrongly (in many ways), and just isn't something to even discuss or consider for new Christians.
We will all suffer in life to varying degrees. The good news is that we might turn to God in our suffering and be comforted and so draw closer to Him. But we might miss that opportunity too. God doesn't will us to suffer. It's just a mercy that He CAN use it if we cooperate.
It might be necessary for a person who, for example, has no compassion and so no love for others, and by suffering that person might learn compassion and love. But most suffering is just because the world is fallen.
I know I'm telling you a lot. But it is CRUCIAL that we understand Who God really is. Too much of Christianity paints a warped picture, and they DO make God into some kind of monster that non-believers are right to reject, to be honest.
I've been through many denominations myself in my life, so I know what many teach. And it can confuse. I'm thankful to have been pointed back to the writings of the earliest Christians. It's like the veil for me was drawn back and I could finally see that God truly IS love, and why evil happens, and finally it all made sense.
That doesn't mean it's all warm-fuzzy feelings all the time. Life is about growth and becoming like Christ, through turning away from sin, caring for others, and so on. But that process leads to seeing God in creation and focusing on what is good, and comfort in all situations.
I pray you will find help and begin to see clearly and put away the wrong ideas about God. I know that's a miserable place to be.
God be with you and have mercy on you.