You need vocal lessons if these things apply to you.
1. Getting hoarse regularly after performances.
2. High notes are tough to hit.
3. Singing in the same key.
4. Always being out of breath; not being able to hold notes for a long time.
5. The voiced getting fatigued quickly.
Read the full article here: http://the-music-ministry-coach.com/2011/10/5-tell-tales-signs-you-need-vocal-lessons/#axzz1fL8DdtR4