I have a recommendation that will save any aspiring guitarist a lot of time, money and frustration. Maybe you spent a lot of time and money like I have on various guitar instructional materials - books, DVD videos, Internet lessons and downloads, etc. and still are frustrated and disappointed with your lack of progress like I was. Sometimes even beginner lessons with an instructor are not as productive as they could be. The problem with all the content material is that it is woefully lacking in specific guidance about how to practice that will develop the physical ability to get the results you want to actually be musical.
Playing the guitar is first of all a physical activity and we need guidance and specific instruction to develop the physical dexterity, strength and control of our fingers, hands, arms, shoulders, breathing, etc. that are required to play and play well. If you feel your practicing is not getting you anywhere then you are not practicing correctly and may be doing more harm than good. You may become frustrated and discouraged, develop bad playing habits and think the guitar is not for you. Actually, as simple as it sounds, you just need to know how to practice to get good results.
I'm a beginning guitar student and write from that prospective. All those content lessons tell you what to do but not how to do it. If you can't control your fingers and cause them to do what you want them to do you need to know and follow the Principles of Correct Practice for Guitar as developed by Jamie Andres. As a beginner I highly recommend the book and DVD with that title. It is the only instructional material I have found that explains and demonstrates the physical aspects of learning to play the guitar. We need the knowledge, skills and exercises to develop the correct use of our fingers and hands that are contained in the Principles of Correct Practice. It works for everybody regardless of experience or so called "natural ability". Get this book. You will be glad you did.