Fed Up

I have been with my SO for what will be three years in October. We have a one and a half year old son together. At this point in my life, I am getting annoyed with everything that he does and of course, everything is my fault (in his mind). I am turning twenty one on June and he is turning twenty three in July. He is the one that acts the youngest and I feel as if I have to raise two children. I kind of just want to be alone for the time being so that I can get to where I want to be in life without the constant worry of having to deal with a grown baby. Should I just stick it out and see what happens in the next few months? Has anyone ever been here before?