Learning a musical instrument is bound at times to be frustrating. There comes a point when you wish you could play better. If you are listening to Tommy Emanuel it must be really frustrating for you if you aspire to that level of technique.

A lot of what you are going through is psychological. One way out is to find other musicians or aspiring musicians at your level and get together with them on a regular basis. You'll find that you will improve through this interaction.

It is good if you can find the specific point at which you find this frustration. Sometimes a good teacher can help here.

The best form of practice is not mass practice but distributed practice. This means rather than an hour a day, make it say 15 minute segments throughout the day. This enhances muscle memory. Also, in mass practice, there comes a point where the learning process breaks down and it's time to take a break. 2 years is a short time. You are expecting too much of yourself. Getting together with others will enhance the process of learning.