struggling to adjust to toddler-hood

I feel like such a shitty mom to say this but even though not a minute goes by that I don't love my son, sometimes I don't like him all that much. How did we go from babywearing and celebrating milestones to hitting and intentionally throwing things at me? I'm trying to set boundaries in a healthy way and not "pop" him or yell, but sometimes I just lose my patience and my temper and it's not like a one-and-a-half year old will just give me some space. I knew that toddlers were difficult, but I didn't know firsthand. Like, how do you get them to freaking listen to you?? I just need advice or at the very least, shared experiences. Help, please!!