Just practice 15 more years Dude, seriously, don't be so hard on yourself, at one time all those chords were impossible to play weren't they, but you caught on and you learned them, when I was 14, I couldn't even spell cord, I mean cored, or chorde, well you know what I mean, you already have a foundation to build on, just keep building on it, it all comes one day at a time, and probaly by the time your at the ripe old age of 15 or 16 you'll be smokin' that neck like a cheap cigar, keep at it........