Push away

So I have a flight or fight response, where I sorta start pushing away my friends or isolating myself away from them, because I don't want to suddenly became a burden to them or always constantly bother them or be clingy. And I don't want them to always have to carry the weight of me talking about my problems, so I just push them away. sometimes without being too. I know that is bad and good communication is key to friendships and relationships. I just get really worried and scared that I will annoy them or won't be good enough for them, that I just push them away. I want to stop doing this, it just becomes a habit in my brain to do