help

This is a 1.31 minute video response from Mark Lincoln on Nov 1st, 2008

Question:

"Puma_jaguar asks, "Hi My name is Saul ,im taking lessons with Steve Eulberg and im a begginer i really enjoy the lessons, i have an acoustic guitar Esteban legacy AL-100 41" and i think that the neck of my guitar is very small im not sure,the top of the neck is 1 5/8" and low is 2 1/8", i have problem when i'm playing the easy c cord ,my first finger hit the second string first fret, but when im playing part of my tip of my finger touches the first string too and it makes a buzz all the time i dont know if it is because the neck is very small and the strings are really close could you tell me, if there is a position that will help me not to make my tip touch both strings ( how will i change to easy c chord to d7th chord?) if the neck is small or how should i bend my fingers in this case? . how should i hold the guitar guitar easier? is the position of my thumb incorret ? thanks""