I haven't taken it myself, but I have lots of clients who use stimulants. Was it a psychiatrist or a primary care physician who prescribed it to you? Did you have major problems with inattentiveness before you were 7 years old? Research shows there is no such thing as adult-onset ADHD and where some adults certain have ADHD that persists into adulthood, lots of adults have problems with inattentiveness due to other things (that stimulants aren't as good for).
That which does not kill us only makes us stronger.