Use care whenever you use your voice. Your voice is your instrument. Overlooked habits such as coughing, clearing your throat and yelling all contribute to vocal fatigue. You can easily tire your voice before you even begin practicing your pop music.
Study with a teacher. A voice teacher will help you improve your vocal technique in order to sing your favorite pop tunes with ease. They may recommend vocalises (exercises) and other types of music, such as a beginner's Italian opera aria. Enjoy learning other types of music as you become a better singer; many pop singers have studied classical voice to gain a better understanding of their instrument. It may take several months of training before you can approach your favorite pop song, but your larynx will be more stabilized and your overall technique will show improvement.
Sing songs that aren't too difficult; select the right music. Your teacher can help you identify which pop songs are appropriate for your stage of development.
Practice daily, but don't overdo it. One hour every day is sufficient. You can work on memorization and practicing rhythms if you want to work longer.
Observe yourself. Use a mirror during practice sessions. Stop whenever you see tension, which is the tell-tale sign of a high larynx. Tension mostly occurs in the upper body, jaw area, shoulders, face and neck. Note when the tension and high larynx position occurs so you can discuss it with your teacher, and stick to easier songs or exercises that you can sing without difficulty in the meantime.