you don't need to worry about injecting into an ab. If you do, it might hurt a bit, but it makes not that much difference.
If you use your needle in a 45 angleyou should not have an issue al all. Just put it in 3/4.
1/8 is kind of bad, as half of your shot most likly came out again :P
also, you bearly went through your skin layers! If you inject in your skin, you are doing something wrong!
Do some more research, there are some awsome posts on the board, even one with a nice movie on how to inject
