Better depend on oneself than ask for help from others

I often think that why am I being like this? Is this worth for me to do so? Am I right...or wrong? 

I always help out my friends that I admitted. I do my best in supporting them as they request. I do so because I think they are my friends, and friends should help each other unconditionally. That's how I define 'FRIEND' and at least I have a clear conscience. I have even told some of my BEST FRIENDS that I admitted of course, about my secrets that I don't even tell my mom. I shared with them because I have trust in them. But, I'm not sure whether they consider me as their best friend too and keep it secret between us only, or they don't think the same way as I did and shared my secrets with others like a story or a joke. I have no idea of what they think and feel on me. Well, I don't really mind this much now anymore because I've learnt to expect the baddest result or worst condition of every action or decision I have made. Hence, I will be responsible for that. For helping each other among friends, honestly, I'm absolutely disappoint. After I helped them, some of them don't think that they should appreciate for my support although it shouldn't be necessary among friends. But some of them thought that it's necessary for me to help them out whenever they request. Thus, when there were a few times that I couldn't help, they were like pissed-off. And, when I please them another time for something, they may just rashly answer me or even ignore me. They don't help me in return even once. Seriously, I'm pissed-off too. That's why I don't have trust in human beings anymore...honestly, even family. The feel of betrayal doesn't feel great once you have experienced. For those who did this to me, trust me... I'll treat you back in the same way. I don't owe you. So why must I help you whenever you please? Give me a reason then maybe I would consider. From the experiences I have learned, finally I realize and believe that human beings are actually selfish... Thus, trust is actually never exist.

 "Better depend on oneself than ask for help from others"