I am currently a research assistant at an american university. I have worked under my current supervisor since my first year of undergrad. I am now working under them in a postbac position. Thus, this is my 5th year working under them. During this time, I have worked on the same project. This is a theoretical physics project, and it is not all that involved.
Working on this project for so long was normal during my undergraduate studies, as I initially knew only high school physics, so I really could not do or understand much up until this past year. Now, I have, in my opinion, done the project to the best of my abilities. I have performed the task asked, but I have not been able to generate the final result proving that it works. I have expressed to my supervisor many times that I feel I am unable to generate this result. I have checked all my work theoretically by hand, and I have checked my code extensively. I do not know what the problem is, and I have been stuck on the same issue for years now. When asking my supervisor about this, I always get generic remarks like "try a dummy example", "debug the code", etc.
I understand fully that research is about debugging these sorts of issues. However, I do not feel I am learning anything in this position or that I will be able to do more than I have on my own. I tried to express these cocerns to him and he said "Why are you so easily discouraged? This situation is quite common in research, and most supervisors are worse than me. If you cannot solve this problem and you push through, this is how people end up in positions they cannot actually fulfill."
I can sense that he is saying "you should be able to do this, and if you cannot, then you will not be a successful physicist". I am suspect of this sentiment because I feel sticking with a research project for 5 years is not being so easily discouraged, but I am not sure if I am indeed being the problem by seeming like a snowflake child.
In any case, this feedback really worries me. I know that this level of independence is expected of graduate students, but I am not a graduate student. I just finished my bachelor's degree in May. I am left feeling disoriented about my capabilities and unsure of how to improve.
In summary, I have two issues. 1) I want to be a researcher desperately. I have already been accepted into 5 PhD programs for this upcoming fall, and I am scared that I do not have what it takes to do them given this experience. I fear that, instead of improving drastically in this position, I am going to waste it by not understanding how what I'm missing. 2) I do not want to waste my time or the money of my supervisor. I am here to learn and grow as a prospective researcher. I feel that I am being cheated out of that experience, and I feel the professor is being cheated out of a full time research assistant.
How can I navigate this situation, learn, and grow the skills I need to in order to perform better in a research setting? I do not want to quit, but I don't want to wander aimlessly everyday either. I want to gain as much as I can out of this experience.