As a practicing Muslim, I struggle with certain aspects of our faith

I've been wrestling with some deep questions about my beliefs lately, and try as I might, these doubts just won't leave me alone. It's not just about having faith-it's also about trying to understand the nature of Allah SWT. A big part of my confusion comes from not having a strong Islamic background, and I'll be the first to admit that. Life circumstances kept me away from seeking knowledge, which unfortunately distanced me even more from the deen until recently. My biggest question is pretty basic: why would an Almighty Creator, who made everything in existence, be concerned with things like whether we trim our beard a certain way, or if we enjoy harmless art or music, or how people choose to live their personal lives? And if He designed us with certain natural inclinations, why would there be consequences for expressing them-as long as they're not harming anyone, like in creative expression or personal matters? To me, that only adds up if Allah SWT were cruel, but the Quran repeatedly tells us He is Most Merciful and Just. Why does the conversation around Islam sometimes feel so rigid in this life? Yes, dunya is a test-I get that. But does it have to feel so harsh? If it’s not meant to be cruel, then why does it seem like so many things that bring people happiness are either off-limits or heavily restricted? And if it is meant to be tough… is it really worth spending decades feeling unfulfilled, just hoping you got it right, while wondering about all the experiences you might be missing? Some say Islam and prayer should fill your heart with contentment, but for me-and I've felt this way for years-it often leaves me feeling more confined than at peace.