Getting a bit frustrated

I have been practicing alot with aperture size and shutter speed over the last few days, I have been having a lot of fun! I have been having some success with the smaller aperture size to get the background blurring that I like but this is always when I am outside, I am really struggling with indoor pictures that are not taken in automatic & I'm getting a bit frustrated with it to be honest! I am hoping that the chaps on DPS will be able to give me some advice.

Here is one of my successes, I am really pleased with the depth of field in this picture: