You should be properly evaluated. Is the worry genuine or it's over exaggerated and catastrophic. Sometimes people tend to jump to conclusions. Is this problem hampering your day to day life ..are able able to focus on other things. Getting a mental health evaluation will clear those doubts and you might find help.

Beating Overthinking Out of millions of suggestions, I wish to forward you TIPS that worked for me to beat this ‘demon’ during my early days of life. 1.Know Thyself: Try to talk to yourself. Write down your worries. Thus, you are giving birth to your thoughts to action which helps them extinguish 2.Take Action: Once you know what is disturbing you, try taking action. Either eliminate it or do it 3.Physical Activity: Doing at least 30 minutes of workout (preferably aerobic) will do immense change on your thinking system. Irrespective of how your life is now, you will start to feel better, trust me 4.Be Responsible: If you tend to avoid responsibilities (eg: taking care of the pet, doing your studies on time, taking an online course for improving your career) it’s high time you did that, thus filling your brain with a sense of self-respect/esteem 5.Practice Reading/Any hobbies: Reading is highly recommended as it engages your cerebral cortex( modern brain) to execute highly intellectual function, thus barring the amygdala(primitive brain) of the excess emotional surge. An alternative to reading is practicing your hobby 6.Abstain from Addictive habits: Look for avoiding alcohol/drug consumption, binge-watching videos, playing video games, etc. They create a strong neural bond in your brain resulting in addiction. Such individuals are more prone to overthinking/daydreaming 7.Choose your food wisely: Replace junk foods with natural, locally available fruits and vegetables. Your brain will start improving in its function 8.Your Environment matters: Be assertive and say NO to negative people, discouraging environment (a hostile job), or to your partner if you believe they are creating a ‘mess’ in your life 9.Practice Meditation: Meditation is the best tool to tame your brain. Once you catch hold of your thoughts through it, you can be the master of your thoughts. Completely deciding when to think what! 10.Cure Physical/Mental Illness: If the above doesn’t work, please consider a medical expert's help. Your intention is to live better with sanity. You deserve it. Hope you feel better.

Overthinking about routine matters and disproportionate fear in relationships, which interfere with your functioning may be either part of certain personality traits or a new onset anxiety disorder.

Consult a psychiatrist.. You maybe needing psychotherapy and medications

You need psychological as well as pharmacological treatment.. Consult a Psychiatrist