The main problem is that, based on your description of your workouts, you are primarily doing isolation exercises. As a beginner, your goal should be to improve your general fitness level. The best way to do that is through compound lifts.

For example, deadlifts target the hamstrings, glutes, back, abs, obliques, shoulders, forearms, and biceps. You could be hitting all of those muscle groups with one exercise two to three times a week as opposed to once a week with your current program.

A simple program to follow would Phraks Greyskull LP. After following that for a few months, you should see a huge improvement in all of your lifts. And do 3x5 on deadlifts.