Teething and breastfeeding

My 4 month old has already started teething. He has bitten down on me with all his might a couple of times. I’m terrified to know what that feels like with teeth. My oldest didn’t start teething till he was 11 months. I was kinda hoping the same thing would happen. I also feel like he’s growing up too fast and it’s making me emotional 😭 Will it be as bad as I’m making out to be when his teeth set in? (I didn’t breastfeed my oldest)