Circles are tough, but you can start with ellipses and dial in from there. For them to look nice they have to be done wit a certain speed. What I see on your example is that you draw them slowly, "paining" them. What you are looking for though is sketching techniques.
So here are some basic things you can do:
Instead of rotating your wrist joint to curve the line, keep your wrist straight, lift your elbow up from the table and draw with your whole forearm moving. This takes a bit of practice but you can draw many ellipses and fast. And due to the whole forearm moving, your line becomes more steady.
This also helps with control of pressure. Try to barely touch the paper and start drawing thin "helping" lines, once you see you are where you want to be, increase the pressure.
Also, remember that every line has a beginning and an end, thinning out at the start and end. this helps you connect the ends of your circles. Together with enough speed, this should get you nice looking shapes.
Lastly, this takes practice. I have drawn hundreds myself. But it's not hard once you stop slowly painting them but practicing making them past and crisp. They don't have to be perfect, but they need that certain "speed" to not look wobbly.
Here you can see that there are helping lines under the final lines. And that they are not perfect, but have a dynamic to them: