Really, they're habit forming and destructive so don't take them, but the reason they're so popular is they really do kick you up.
Trying amphetamines classically gives short-term euphoria and confidence boost.
There have been a few studies on this. If you give college students amphetamines they will report performing dramatically better, but their actual performance is maybe slightly improved at best and some measures are worsened: https://www.mdpi.com/2226-4787/6/3/58
The notable thing is that they all report doing much better despite the actual results not matching their self-assessment.
So don't "try some" and then think you're going to be speeding around like a superhuman for the rest of your life if you get a prescription.