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First ever? Was it squats or deadlifts? How did you calculate your starting weight?
If I were to guess yes, yes and you're on here because you ride a bike I'd hazard a guess you started too heavy. As you ride you'll have relatively stronger legs than the rest of your body, and more so than the average desk sitter.
5 x is a good balance for stimulating hypertrophy and strength gains. I'd suggest go lighter, not less, at least until the linear progression stalls.
+1, always been absolutely killed by 3x5. And probably had the best gains from drop sets - dropping 5%~ off the second then 3rd set. Means each working set is properly intense.