I feel your pain, I bought my guitar 5 years ago and got frustrated and set it down. I picked it up again two years ago and have been making very slow but noticable progress. The way I look at it I have no deadline on how good I should be at a certine point, I would just be wasting my time if I was'nt messing with my guitar. Don't put unnecessary pressure on yourself. On the F cord, I can not do the open F most people do either. I do a bar fcord much better and easier for me.

 Anyway stick with it!