I was a private music teacher for 8 years. Without seeing/discovering where your current ear/brain/body cooperation is at, the best advice I would often have to give adult students was to give themselves a minimum of 2 years (more or less) before making any sort of self capability assessment. And as a follow on, keep some sort of record of progress to look back on. The inner critic can be brutal. I have never met anyone who couldn’t learn to play keyboard/guitar/drums, or learn to read some form of notation or understand western music principles.