I was diagnosed in my early 20s. Once I matured, I have it under control. I am currently off all asthma meds. However, When needed I go back to Symbicort. I have noticed that unless I am really feeling tight in my chest, not using inhalers is better. They increase my heart rate too much.
But as I learned practising yoga....you must listen to your body. Some days you are great, some days you need inhalers and thus pace yourself so your heart rate is comfortable. A good heart heart monitor is awesome. I have a garmin edge and it helps me on my cadence and heart rate...and when to work it or to take it easy.
Do not let asthma sideline you!