You can just simply say, I am new to this, I have current achievement considered good enough already. But at last, you still have to responsible on what you did and what you didn't do, all the excuses you gave will left to your own ears in the last day.
I have to admit that, I am not really involving in the real business world yet, I am not really putting enough hard work on it. There are so many ways, but I just walked on one of them and cheated myself "well done, you are doing great".
One of my friend told me, don't hold yourself back, don't find excuses for yourself. Find the aim and go for it, without turning back.
In deep of my heart, I am coward, scare of failure, what if I failed after the trying? If I didn't try, I can at least say I haven't try yet, once I do it, it will be great. Coward!!!