Welcome absana!
You've come to the right forum but this particular part of the forum is where questions and answers on guitar 'building' is usually kept. A more appropriate place would be in the section titled 'Players Corner' for future reference.
(helps keep the forum organized. I've made the same mistake myself )
It sounds like you've hit your first 'rut' as guitar players call it and it won't be your last. It's perfectly normal. Be sure to stick with it and work through it cause that's how you learn. Overcome those hurdles and you'll feel a great sense of accomplishment.
Wow, that sure sounded like a surmon
I'll post some ideas I've used to get out of a rut tomorrow and by that time others will have posted better information than I can give
My idea of sustain in guitar playing refers to a note that continues to ring out after the string has been plucked. The longer a note will continue to ring out, the longer the sustain.
A guitars body material, body shape, pickups, string gauge, bridge and nut materials are some of the things that can effect sustain. Amplifier and effects settings and even the pick material as well. There are quite a few things that affect it but I think that's the basics. Sound right, people?