You have set up a defense mechanism for yourself, you don't want to get hurt, and you don't want others to get hurt, you mean well.
Please understand, that you cannot make this decision for them. And if you keep having this attitude, that will never change, and there will come a time where your wall is so thick, there is no breaking it.
Let that wall crumble, slowly, tear it appart, let other's kick at it, brick by brick. It will take time, and it has to. You don't have to overwhelm everyone, or be overwhelmed, if you let your whole wall crumble on someone at once, they cannot handle its weight.
You see the world through such dark glasses, that you can no longer see any of the brightness it has to offer. And some of this brightness is you, and some of the brightness comes from others. Take off your glasses and let the sun shine on your face, feel the warmth and let it soak into your body.
When you let in the warmth that others have to offer, you will see that not all is bad. You will see, on their faces, that you are not just bad, you have something to offer. You are a person and you have a personality and you are unique. And you don't always have to be happy or you don't always have to laugh, but you are here, and you should love yourself just because you are here.
Open up yourself, slowly, and try to see the positive thing in everything, even in chaos, in death and in all the hard things that seem endless and unkind. Know and understand that you cannot change everything. Slowly create that positive outlook on life, and there will come a time when you look in the mirror and you see that the positive is true, that the mirror will smile back at you.