Should I see a psychiatrist because I am unwilling to continue my cancer treatment?

I (22F), 155 cm 41 kg, Southeast-Asian, was diagnosed with thyroid cancer 2 years ago. A total neck dissection was performed on me, and a 40% tall cell variant was found through pathology anatomy result. I have done radioiodine ablation 3 times since my surgery. Ever since I was diagnosed, I felt indifferent about my condition. There was no sadness, grief, anger, regret. The only reason why I went through with the treatment so far is because my mother would be sad if I hadn't complied. So far I have been managing the schedules for the doctors appointments, scans, and therapy appointments myself. I am just frustrated at how complicated things are, I'm just so tired of having to ask for available therapy schedule, running to different hospitals to find my doctors, doing scans, and don't let me start with the low-iodine diet I have to do before the scans and ablations. The specialists that I go to (Internist, Oncology Surgeon, Nuclear Medicine) they are the highest referring Prof and Doctors in my country. The three department even held a meeting to discuss my case. In conclusion, the therapy has been proven to be effective, but they didn't say anything about the possibility of being 'cured' more like 'controlled'. I am feeling fine overall, ever since before I was diagnosed and afterwards, I feel fine no symptoms at all. Just that now I have to take thyroxine daily otherwise I would feel like a zombie. I'm just tired of having to do this not for myself, rather for the people who love me. I don't want to do this for the rest of my life. I am tired.

I told my mother and my boyfriend how I felt, and they dismissed it by saying I am ungrateful (I feel like I am being ungrateful), I shouldn't complain, I should just go through with the therapy and that I don't need to see anyone because I have them to talk to. But I feel like I am very close to a breaking point.

Is this some sort of mental issues that is related with the diagnosis or medications or therapy that I took? Do others with similar condition go through the same mental state? Or is this a different, unrelated issue that I need to get it sort? Is it necessary for me to see a psychiatrist/psychologist?

Additional information: No other medical conditions/history, I do not drink, smoke, or do drugs. I am on levothyroxine 100mcg/day.

Thank you very much for your time and help.