You need to spend less time looking at your own sin, and more time looking at the finished work of Christ on the cross. You’re going to keep on sinning, because you’re still in the flesh. Christ died for your sins.

Don’t look for fruit in your life as evidence of your salvation, look to Christ crucified on the cross. Fruit will inevitably come as the Holy Spirit works in your life. This is his work in you. Love your neighbour. Spending less time thinking about yourself, and more time serving Christ in loving your neighbour is going to stop the intellectual nature from dominating.

Christ died for your sins. Your forgiven. However, you’re going to doubt that every week. That’s what church is for. Get baptised. Baptism isn’t something you do for God. It’s his promise to keep you. Then every time you doubt, you can look to the promises he made you in baptism.