How do you keep going when life feels so heavy?

Salaam everyone. Just needed to get this off my chest, and I'd really appreciate hearing how you handle constant struggles and that deep-down exhaustion. For nearly ten years now, life has just been one hardship after another, and I'm still young. I've lost so many loved ones-grandparents, aunts, uncles, and even my own dear mother, one by one. I've been struggling mentally, physically, and in my iman for so long, and nothing seems to bring lasting relief. This past Ramadan, I was at the masjid almost every day. I made dua and cried to Allah every night, asking for ease, for guidance, for His help. But that sense of peace just doesn't stay. The moment I finish my salah, that heavy weight of the world crashes back down. It feels hopeless, like I'm trapped no matter what I do. A big part of it is this crushing loneliness and feeling like a failure who hasn't achieved anything. It's led to so much self-doubt and even hating myself. Sometimes I find myself asking Allah if I did something terrible to deserve this. I know I'm not perfect, I make mistakes, and I always seek His forgiveness in my prayers... but I don't think I was ever that bad. And yet, I see others who do wrong living happy, full lives. I understand that Allah tests His servants, and I know He doesn't burden a soul beyond what it can bear... but subhanAllah, I am just so tired. It feels like I'm failing every single test He sends my way, and before I can even catch my breath, another one hits. Every time one part of life gets just a tiny bit better-whether it's studies, work, family, or finances-something else falls apart even worse. I'm exhausted. With all the stress, my heart feels old and worn out. I genuinely don't know how much longer I can keep this up. After every salah, my dua is the same: 'Ya Allah, either take me or help me,' because I'm just so tired of fighting.