I struggled to lift twice as much as I normally would have
Why would you lift 2x as much?
I like to challenge myself.
If you try to do too much you can injure yourself. When trying new things it is best to go slow and build up to a higher amount.
That really sucks. What's the point if I can't even lift that much?
There are serious injuries that could happen if you are unprepared. Like breaking bones or dislocating a shoulder. If you hurt your shoulder you may never be able to lift again.