Get in a band......its as simple as.
The only way to find out how 'able' (not good) you are is to do the task at hand in a band situation....
Maybe you cant find a band,then play along with records,you need to be in playing states that push you,make you try to achieve....
Take a record,by a band you really really like,and learn it,in/out/every nuance ..and mistake,of which you will find quite a few...learn all the lines,till you can nail it in your sleep....learn to read music,the technology of music changes,and what ebbs/flows as 'popular'..like you own personal tastes will change,but notes never do,it the one of musics few constants.
If people are saying you are doing well,then take it as,there's nowt much dramatic happening and you are doing well,there's always something to learn...a riff or lick to cop from,a technique,a style to try out,a tune to take an idea from....
There is sadly no yardstick to measure what good is....as long as you are capable,reliable,and able..then in my book thats good.
DONT STOP LEARNING!!!!