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If I may ask, what is it that keeps entering your mind? What is it that keeps giving you so many worries?

You mentioned that you get irritated for no reason at all, but also don't want to be stressed so ignore uncomfortable feelings. Perhaps these two things aren't so disconnected?

It's perfectly ok to want to avoid the things that cause you stress. It's human nature to want to avoid negative feelings. However, sometimes tackling these negative feelings is the key to overcoming them. Think about what's making you stressed. Is it the thoughts that go through your mind? What kind of thoughts are they? Are they the kind of things that can be easily solved? Or are they rooted deeply to a larger issue? Also, your feelings of irritating may likely be connected to you whatever may be going through your mind. In an attempt to control how you feel, your suppression of those feelings may be causing these feelings of irritation to occur.

In relation to your heart palpatations, the NHS here in the UK has some great information on them: https://www.nhs.uk/conditions/heart-palpitations/ though I would definitely agree with Lynds and get yourself checked out by a doctor just to be safe.

I can't say whether or not you have anxiety. Obviously I'm no doctor so can't diagnose you. There are so many causes of anxiety that it would be impossible to pinpoint without professional help. TeenHelp actually has a resource committed to Anxiety. The site does explain some causes of anxiety which you can find here: https://www.livingwithanxiety.com/causes

In the event you manage to get an appointment with your doctor, it would be a good idea to mention to them about how you're feeling emotionally as well. Your potential heart palpitations and anxiety may very well be connected. Your doctor may be able to prescribe you something to help, or refer you to another medical practitioner.