Although meditation, working-out (or taking drugs for that matter) are great ways to appease your inner monologue, they are only temporary solutions. I think it's worth learning how to "debug" yourself. By "debug", i mean observe your train of thoughts and try to understand what makes you scared or worried.

Imagining that you're listening and giving advice to a friend can help ask the right questions.

In my experience most anxiety comes from imaginary rules/limits that we force onto ourselves... if that's the case, you can ask: where is this rule or limit coming from? is this something truly helpful or something that has been decided for me by society? would your life be better without?

Also, obsessing over the past or the future is generally source of a lot a bad feelings. Young children don't know anxiety because they aren't thinking about either... Sometimes, making sure you're enjoying what you're doing right now and/or doing your best with the current parameters can help staying on the "path of least regrets"...

Although we all seek to avoid them, "bad" times are a necessary anchor point to appreciate "good" times. But with the tools above, you should be change your perception and feel better :)

Hope that helps.