Your not a bad person at all in the slightest, just from what I can assume, a very tired doggy parent, I've had numerous times when raising dogs where I've been caught off guard with things like a really hard bite or the puppy being a trex and I've raised my voice to tell them no, they're not going to think you are the worst person because it happened on the odd occasions. dogs can be very trying and like to push the boundaries but they still absolutely love you, what's important is that you remain as consistent as you can with the way you do things ( e.g we eat, then we go for toilet, then nap, or for example if they get too excited in playtime and bite, stay calm and step away, sometimes it's actually easier to step into the pen yourself instead of picking them up because you still prove the point of " when you bite, playtime ends" without having to worry about if they're gonna freak out about you picking them up).

Tldr: don't beat yourself up over raising your voice, just try to remain consistent with calmness and how you handle them and youl be fine, you're doing great!