My ambition can be equally destructive and beneficial. I have a tendency to be overly harsh towards myself, something I try to keep in check. Sometimes I struggle to set myself goals because my aims are too vague. However, I dislike not having a goal. I become bored quite easily. A lot. My tendency towards boredom is something that actually motivates me. I need something to occupy my mind or I go a little stir-crazy. When I break up for my summer holidays, I often experience a significant drop in my mood. I actually miss the work. Granted, I complain about it during term time. Despite the fact that I know that when summer comes around I'll look at those busy days fondly.
I sometimes underestimate how long things will take and attempt too much. For example, I once got an assignment where we got to design our own brief and create whatever product we wanted. Did I decide to do something easy? Well, I could've done but no I just had to complicate things.
I got a good grade on it, but I was still unhappy with the end result. Due to time limits I wasn't able to add all the features that I wanted. I am especially harsh when it comes to my own work, and sometimes it holds me back. (Procrastinating on something because I know that I can't get it up to the standard I desire at the time being, because I haven't fully developed a certain skill. Alternatively, sticking with what I know because although the other option could greatly improve my work it's risky and I might mess up on it. Consider both together and it becomes clear that it is a self-destructive cycle).
Usually I find it harder to finish than start since it means finally having to leave my work alone. I can easily tinker with things for way too long if I'm not careful.
Also, I've noticed that when my sinuses clear up my productivity increases dramatically. I have chronic sinusitis and I'm so used to it that it's actually a shock whenever I go somewhere with especially clear clean air. My brain usually feels a bit foggy most of the time, and when that fog clears my thoughts suddenly become faster and sharper. I almost feel like an entirely different person. Occasionally I'll have days like that. I'll wake up and just know that it's going to be one of those days. Shame they don't happen more often.
My dad has noticed the same thing about himself. He tends to make better inventions and think more clearly when his sinusitis lessens since his brain feels less foggy during these times. I don't know if this is just correlation, or if there's something to this concept. 
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25. Near the spectrum but not on it.