(19m) Fiancés (20f) family constantly takes jokes too far

We’re engaged but live separately, she lives with her parents and I live with mine as we can’t afford a place together yet. For a bit of backstory, I struggle with sticking to jobs, I’m always swapping and changing, exploring different industries while I’m still young and not tied down by a house or excessive bills, which my fiance doesn’t mind, she understands. Now I can take a joke longer than a lot of people, I’m a patient guy and have never really stood up for myself, especially throughout school and what not.

Anyways, onto what I need advice on. So for months, throughout me swapping and changing my jobs, I’ve been getting slated for it by my fiances family. Everytime I quit a job to find something else, it’s always “here’s that jobless bum again” or “can’t even stick to a job”, etc… Now this was a joke at first, fair enough, they are the joking type, but recently it’s been getting brought up into every conversation. I go up to my fiancés house to spend a few hours there, unfortunately we’re not allowed in her room even though we’re way old enough so we have to sit in the living room (it’s been like that for nearly 4 years). Anyways, i try to talk to her parents about general stuff and every single conversation i try have the slip in, what feels like a dig, that i don’t have a job or that im a bum, or whatever they can pick at, literally every conversation or interaction that I have with them. And what it’s not my employment the are making fun of, it’s my car. I’m young, my car is a shitbox, but driving is one of my only hobbies that genuinely makes me happy and that I enjoy, and like any car guy, I love my car, it’s my pride and joy. But like the job thing, the also pick at that any time I mention it or mention some new parts that I’ve put on or whatever. Just saying things like “pile of shit”, “scrap it”, etc… and that’s stuff is a joke, don’t get me wrong, but once again, it’s mentioned all of time and it’s starting to piss me off.

I can take a joke, don’t get me wrong, but when my only hobby, and employment status gets mentioned constantly whenever I’m in their presence, even though I try keep myself to myself and just spend time with my fiance, it becomes more than a joke. It’s getting to a point where it’s making me feel like shit, making me feel like less of a person because no matter what I do I get the piss taken out of me

Tonight I told my fiance that I’d had enough after I updated my Facebook cover with a pic of my car id taken with my new camera and more or less instantly, I had comments from her dad with the same usual shit “scrap it, shitbox, etc…” but then her dads friend, who’s currently staying with them, jumped in as well saying the same shit and then mentioned about that I need to get a job and buy a less shit car and that I can’t make mine look decent because of how shit it is. Like it was just a pic of my car man on MY Facebook and I’m getting shot down for it. I want nothing more than my fiances dad’s validation as I grew up without a father figure in my life so I see him as sort of that. But now I don’t feel like I can see him at that any more because it’s just constant child’s play about my life and constant piss taking. Back to it, my fiance understood my point and had enough so she messaged her mum and her mum turned it all around saying, in other words, that I’m a pussy, I can’t take a job, they just won’t speak to me from now on, basically same old manipulator shit. And I was on the phone to my fiance at this point so I heard everything.

I guess I just don’t know if I am being a puss about it all. Am I? Or was I right for standing up for myself when I felt it actually hurting my feelings? I don’t know if I’m in the right or not.

TLDR: constantly have the piss taken out of me by my fiancés family for switching jobs a lot and how I have a shit car so much so it gets brought into every convo and it’s getting to a point where it’s making me feel like shit. My fiance tried to speak to her mum about it but her mum basically just ended up calling me a pussy and that I should take a joke.