I have a DS who is 16 months old. He's a bit wild, into absolutely everything, throws everything everywhere, won't sit still for 2 mins, has the attention span of a goldfish, needs constant attention etc. But is also loving and cheeky and hilarious.
I keep finding myself getting really angry with him when I tell him no and he doesn't listen. And I will admit I've smacked him (not that hard) more than once 
I get so upset with myself for losing it and I really want to change this. I know it's me that has the problem and not him, he's a baby and doesn't really understand but I just get sooo frustrated with him just doing the same things over and over, I feel like I'm shouting 'NO' or 'STOP IT' on a loop all day because he's goes on a mad one doing things I've told him not to. I know it what's toddlers do and he's exploring etc but I just can't stop getting so wound up. He also looks at me with this face as if to say, I know I'm not meant to be doing this, but I'm going to do it anyway cos I know it will spark a reaction.
This morning I've tried staying calm, and explaining that no, we don't do that etc, but he's been reeeeally pushing it, and after the 20th time of doing the same thing. I've snapped and screamed at him 
he's now sat happily and quietly playing with his toys.
I'm sat here crying because I'm such an awful Mum, and wondering how I'm going to get through the next 17 years of parenting and not fuck him up completely! Just don't feel like I'm cut out for this. Me and DH want more kids but no idea how I would even cope.
He's also not been napping great during the day (night sleep has been all over the place too but seems back on track now) and I get so angry, he screams and screams and chucks everything out of his cot. I get so angry then too.
DH can be a little bit shouty too so we both need to adapt a calmer approach, but I am definitely the worse of the 2 of us. DH was bought up in an abusive household and really doesn't want DS to grow up being screamed/shouted at, or hit.
Please help and don't be too harsh because I already know I'm an awful mum right now