u/Direct-Gap3193

Got my first race bike

Size 60 (recommended size 189-195cm) cube attain c62 slt

I'm 193cm, 90cm inseam

Cube retailer recommended me a size 60 after doing some measurements even though they didn't have a size 60 in stock (they had a 58 but according to them a 60 was more optimal). Had to get it online because no retailer had my size in stock

So I'm new into cycling. But for the few short rides I've already done, I've been feeling some lower back-pain and sore hands (feel like I'm putting too much weight onto my hands).

Any recommendations on the fit or is the fit good and I just need to adapt / get stronger core muscles etc? Don't have a static/roller yet so my video isn't optimal