Please help me in taking decision.?

Nultiesse

I am a software engineer. I am working with a company since 4 yrs. I do not talk much with others. One of the reason of it is: I always feel I am a failure in my life. I am always in a very frustrated mood. Because I am not good at coding. Now I am afraid of the coding. I have a fear in my mind that anytime I will be get fired from office. I am trying hard to write good coding. But I have limitations. I feel I am just good for nothing. I really don't know how I will overcome it? I am also trying for bank PO. But still not getting success. That is another thing. Now my major problem is I want to get out of this frustration. At least I have to find out a way to live. If I get bank PO job then its very good otherwise I have to do something for myself and also for my family. If I could alone then I may commit suicide but I have my family. I can't do that even if I want. Now the appraisal time starts in our company. One-to-One meeting will held from next week. Will it be fine if I will disscuss all these(what I have written above) with my team Lead. How he will react. Will he fire me??   
Please suggest something.