Bad parenting????

I just needed to vent. Im tired of feeling like a shit parent. I had to move back in the parents after I left my ex. Well ever since I found out I was pregnant I've been so tired. My son has been acting out, throwing fits, hitting, kicking, you name it. I went to brush my son's teeth bc he won't stand at the counter to do it without throwing a fit. Well my dad was like your never going to win this parenting stuff. You never feel like fighting with him. I'm exhausted and fighting him causes me so much pain.