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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.
Tried my first 5x5 stronglifts today.
Might try your method as it felt a bit much and I wasn't really pushing much.