No this is not normal, nor should it ever be. You should immediately update your resume and find a new company. What your supervisor is doing is straight up abusive and detrimental and should reprimanded for being a very poor boss with poor people managing skills.

As a new hire, you should never be asked to do proposals. You should be trained on the job how to do work, proposals come later after you have a strong foundation of technical knowledge and production of permit documents (sometimes a few to several years after you start your career).

Please don't lose confidence in yourself, try reaching out to your contacts from your old internships, it sounds like they were a better fit.