I tend to overanalyze and worry about things too much. And then I dwell on issues which makes me worry even more. Why is that?

raise your understanding. 'what happens to us in life is not in control, but how we react to it is.' Also, do more physical activities to stop overthinking.

Don't sweat the small stuff, and it's all small stuff
https://sushantdhamecha.files.wordpress.com/2015/10/dont-sweat-the-small-stuff-by-richard-carlson.pdf

I'd recommend you read up on anxiety and ways to reduce it.

Ok, so you have learned this doesn't work. Maybe try to get out or your comfort zone.

sounds like you suffer from anxiety hun.

do some relaxation or yoga classes☺

Life is like black jack. U win u lose. If u win all the time, you're probably cheating and if you lose all the time, I would say some is fucking with you.