What am I feeling?

So I'm 22 weeks and my baby moves constantly. Sometimes they're just kicks but other times it's like she's rolling around or sticking out and if I put my hand and press on my stomach, sometimes I can feel something extremely hard sticking up. Is it probably her head or little butt? It's soooo weird. It's definitely part of her I just don't know what part! I mean I guess none of us have x ray vision but idk it's just such a strange feeling