23 y/o exercise regularly. I take 60mg Adderall (dextroamphetamine and racemic amphetamine) XR daily. When I do cardio/jog I have to constantly slow down or stop b/c I get tired and my hr gets to 188bpm. Is this normal?

Yes. Adderal is a stimulant, amphetamine salts, and causes increased heart rate.Subtract your age from 220 to find maximum heart rate.
NORMAL? I'm not sure that a pulse of 188 is desirable. You might try the same exercise without addresll and see what happens. But what's your resting heart rate and blood pressure? If you were taking Adderall (dextroamphetamine and racemic amphetamine) without an increased heart rate/ blood pressure, i would be more comfortable. As it is, i'm not.