You are good enough to start.
Whenever I go through a particularly busy period in my life and my painting practice is reduced to the bare minimum, unhelpful doubts tend to resurface and try to discourage me. However, I’ve found that once I start painting, those negative thoughts about my painting abilities take a back seat. These unhelpful thoughts usually arise when I’ve stopped painting or am trying to restart my practice. Having painted for a while, I understand this tendency in myself and have the mental tools to cope, yet it still persists. The only effective remedy I've discovered is to confront those negative thoughts and paint anyway. I simply pick up the brush, regardless of my doubts. I also remind myself of the fundamentals and why I paint in the first place: I paint for myself because I love it, and I want to improve. That's all that matters