Thank you for sharing Alicia. I also overthink at times. But I am slowly getting out of it as I grow older.
Just think of a number of decisions you took in the past or projects that went well, despite your misgivings, and you will have more confidence to proceed with what you want to do. Do your research, ask for advice from reliable people, then go for it.
Wish you all the best in your plans for 2021.
Thokozile.

I used to before. It happens that I overthink, but not so often anymore. I have learned the hard way that to get things done I have to do the thinking before or later. Now I just stick to my plan.
As an affiliate marketer you can sell others products.

You say, "I am really interested in e-commerce. But I do not want to responsible for shipping or customer service."

Me too. That's why I do affiliate marketing.

Sometimes I sell a digital product that I or my husband have created, but in that case I try to make it very smooth for everyone.

Oh yes, I do too and all the time but I am reminding myself to just take it easy and do not over think too much. Nowadays, I try to talk like I talk with my friends rather than to some highly qualified audience who might possibly laugh at me.

Most of the time, I avoided overthinking. I'm not too fond of the feeling of depression, anxiety, and overstressed. I don't want to get sick of it. What I did is If I notice that I am stuck on something thinking about it, I find a way to resolve the problem as much as possible. Focus on solving one problem at a time.

So, I'm not going to worry about it again. All I have to do in a day I put it in a long list, even a little problem at home, like a simple repair, I include them to my list to do in a day or within a week and a month monitoring them daily. And put shade those I finished, so less of thinking and worry. Thinking too much preventing you from getting anything done, and it wreaks on your mood.
Thank you for sharing.
Thanks,
Joyce