A little problem I have

My parents keep asking me on what I plan to do job wise, later on with my life. From the start I never really had an answer with this question because I never really had those dream jobs when i was a kid. And I find it shameful that I'm already in the stage to choose a career path yet I brought the same "I don't know" shit up until this day. So, I decided that I should just go with whatever I find myself to atleast do a little bit better at. This idea sort of helped me and I was able to atleast narrow down some careers that I would want. But whenever I try to bring up the ones that I thought of with my abilities, they would disregard it with the same excuses as " are you even gonna earn with that job"(Pertaining to lab work, I'm quite adept in chemistry). Not to mention, I never wanted to talk about this again when they just laughed when I said I wanted to work on the medical field, specifically psychiatry. Dont get me wrong, they never really cared about whichever I wanted to do, telling me to pick on my own. But I just dont understand that, the moment I bring it up they just shut me down. I know that they're just trying to be practical, but man it just really hurts me. I know that it may sound ridiculous to them because it's rather unheard of or just hard to achieve, but every time that they do it, it just sounds like they don't believe in me and that really hurts