You shouldn't "worry" about anything. Worry happens about future potential problems and we should be only dealing with what is right in front of us, right now.

Give an example of something you think maybe you should worry about? (Think about that for a minute: "Should" I worry about X" -- it sounds "funny.") If you have an actual problem, you work to solve it. You can't have a problem in the "future" ("What if I get robbed tonight?"), even in the "present" future (it is "tonight") because it hasn't happened yet and probably won't. We can't tell the future so we have to let things "happen" and then work to help the ones we don't like.

Worrying you'll flunk a test can be "fixed" by study now, before the test but no worrying or studying can fix that an hour before the test so it's just wasted energy to worry. Being afraid of ticks and wanting to go for a walk in the woods; you wear socks and long sleeves and a cap. Figure out what any "problem" is, whether real or OCD-created and figure out how to solve it.