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I have suffered a similar thing, your doc should be able to prescribe you anti anxiety meds if need be. But know that these kind of problems usually stem from habitual thinking, you just need to not be too hard on yourself but try to slowly break the habit by thinking differently. Rationalise it by telling yourself that your over thinking is detrimental, yes you may feel like your over thinking may have its good points but know that overall it is negative, so regardless of any good points it is better to just not do it so much! :)

You are a person who likes stability, and right now the teen years are full of change, your body changing, getting new feelings physically and emotionally, doing new things, being asked to behave in a more mature way. all is change, all is different.

Some people, when they sense something is different it triggers some kind of panic response: your heart rate goes up, you get shaky, you get super alert like you describe. The panic response is done to help you escape from danger situations. But in your life, something that is new/different is not danger, but your body is treating it that way. You need to use your mind to calm yourself back down. the mind can control the emotions. So when you feel yourself getting antsy, you pause, evaluate the situation, and then you say, I am not in danger, there is no need to panic, and then you can calm your self down by taking slow deep breath, hold a few seconds, release. take several slow breaths, it will calm you and help to break the panic response. This is a new skill you need to learn, and it will take time to learn it, so just keep trying and after awhile it will become almost automatic.

Yes, over-thinking is definitely a huge symptom of anxiety, and doubting everything..

Best thing you can do is find ways to relax and enjoy yourself, and recognize the anxiety when you have it and do your best to ignore, I know it's hard.

I've had bad anxiety for 3 years now.