Is every soul born equal in faith, or does Allah create some with more inclination to sin?

Assalamu alaikum, I've been pondering something: does Allah create some souls with a greater ability to do good, while others are made more inclined toward evil and lowly deeds? And if that's the case, how is that just? Like, if Allah made my soul with less iman than, say, a scholar or even a Prophet, then no matter how much effort I put in, I can't reach their level of piety. How is that fair to me? If He created my soul drawn to filth and sin, while another person naturally leans toward goodness, where's the justice in that? Or is every soul born in a neutral state? I was thinking about why the Prophets were chosen for that role. Many say their souls could bear the burden... but *why* could they bear it? It must be because Allah designed them that way. And since He didn't design us to handle that weight, we're shut out from the high ranks the Prophets attained. It feels like Allah was deciding my fate while shaping my soul.