I need help with keyword ranking.. please help

Hello everyone,

I have been doing SEO for the past 1 year but all that I see is my page is at page 5 of google.
I don't know what I am doing wrong?
Maybe all that I am doing is wrong.

Can any kind soul please break it down for me?

This is what I am doing right now:

1) registering on social sites - I was told this will get me a backlink
2) blog posting - Do I need to write in my keywords here? or just answer to the topic of discussion?

Please advice me. thanks!