Struggling with turning to Allah only when times are hard

Assalamu alaikum. It’s been so hot where I live, like unbearable. My skin feels like ants are crawling on it, and just stepping outside for a few minutes leaves me soaked in sweat. Because of this heat, I’ve really slacked on my five daily prayers. It’s not just the weather though-every summer I go through this slump where I feel awful and can’t do anything. Before it got hot, I was on track: praying all five on time and even doing tahajjud during exams. But since exams ended, I’ve barely prayed 2 or 3 times, and it’s been ages. Now I’m feeling extra guilty because I’m starting to pray again. Want to know why? The weather’s cooled down and my exams are starting up after a long break. I feel horrible that I only run to Allah when things are easy or when I’m desperate. When life’s just normal, I’m miserable all day and can’t get myself to do anything unless there’s a deadline looming. Like now, I’m getting back to prayer because exams are close and I need good grades. I’ve been guilty about missing prayers for so long, but instead of pushing me to do better, that guilt just made me more depressed and drained my willpower. I know Allah is the Most Forgiving and even when I’m ungrateful, He’ll accept me if I turn to Him. Yet I still feel so wrong. I realize I only find peace in remembering Him, but I just don’t have the energy to act. I’m not sure if this is a faith issue or just my life in general. It feels like if I’m uncomfortable or there’s no urgent deadline, then no matter what I do or feel, I can’t budge. I’m really confused.