So I just performed my first IM injection on myself (go me!), and I'm a little concerned on whether or not I reached the muscle or went too shallow. I used a 22G 1.5" needle for the injection, and I'd estimate I got maybe half of the length of the needle below skin before I felt a slight resistance and didn't want to push farther for fear of fucking something up (my hand was already shaking so much I was terrified I'd break the needle). My leg is definitely feels a bit sore now, but I can't tell if that's the same kind of sore muscle feeling I get after a flu shot or just from piercing skin in general.

Are there any clear indicators or signs as to when you've gotten the needle deep enough to hit muscle, or do most of y'all judge just insert fully to be sure?