I've experienced the same feelings. I can remember feeling sad and frustrated when I first started to realise there wasn't enough time for me to learn all the t

I've experienced the same feelings. I can remember feeling sad and frustrated when I first started to realise there wasn't enough time for me to learn all the things I wanted to learn. How was I supposed to choose? Every little choice seemed like it would have a monumental effect on the outcome of my life. Doors were closing around me with each passing moment. I don't remember exactly when or how my mindset changed, but I know I eventually just started to accept it. When I die, there is no scoreboard. I don't take my skills with me. All my knowledge evaporates. I will likely not even be conscious enough to make a mental tally of my achievements. There's something to be said for relinquishing a bit of control, learning to enjoy the process and seeing where it takes you from one moment to the next.