If bird photography is what you are aiming for you might want to consider the expensive option and the cheap option. The expensive option would be a longer more powerful lens say at least 300mm. And the cheap option would be a bird feeder near a window that you can get close to without scaring the birds. You'll also want to learn how to select single AF points on your digital camera and select the middle point (default is typically all AF points which won't help).
Another thing I noticed in your photo is it appears to have some dark marks on it from either dust on your lens or sensor, it is noticeably in the middle of the frame near the bottom.
Let me know if this helps.