harsh - even though the son is "a financial dependent", he's still classed as being an adult in the eyes of the law. He's 18, or - for all I know - the same age as my DD, who is also in her first year at 19, or the same age as I was in my first year of university (22). And, more importantly... it's his future that he's working towards. Not the OP's. His.
I paid my own way through university as an adult. My DD is also funding herself through the standard student loan and a part-time job, as an adult. Yes; she gets to live at home - but she also pays rent for her bed & board. Because she's an adult. She's my daughter, and if she needed me to help her out and subsidise her - I would... but she's responsible and independent enough (at the moment) to know that, as she is of legal majority, she has to figure it out for herself. Just as I would expect her to if she'd gone to university at the other end of the country. The OP and other parents treating their adult offspring as children when, really, they're not, isn't doing anyone any favours. Least of all the offspring.
I was only four years older than the majority of the other students doing my course - and I was horrified by how immature they all were. My daughter is only a few months older than the other students on her course (summer baby) and she's disgusted (I'm quoting her, here) by how they don't know how to work washing machines, or ovens, or how to cook basic meals - she's had to explain to one girl how you need boiling water to make pasta, for example, because this girl has never had to cook a meal in her life... and has suddenly been turned out into the wider world. And don't even get me started on the amount of her peers at university who blew their grant on partying within the first couple of weeks and are having to beg for handouts from their parents... and are seemingly proud of this fact enough to brag about it.
So, whether the OP's son is a financial dependent or not - he is still an adult, living away from home, with all the responsibilities for himself that entails. And, as his mother, the OP really has to let him figure it out and trust that she's raised him well enough to do so. Because at the end of the day, surely that's what it boils down to? Whether or not the OP believes that she's raised her DS well enough to survive without her constant interference in every aspect of his life.
I think she has.
She just needs to believe that, herself.