Is it normal that my parents downgrading me?

a quick background of my family, my parents are both old about 60-70 years old in range, i'm the only child 21 years old male.my parents are both religously devoted and aggresively fanatic and my parents work as a doctor, but my father retired because of age. our socioeconomic status is lower that of a normal doctors. my parents are obsessed in degrading our financial status because of religious belief to surrender all your wealth and materialistic attitude so the result is there is no surplus budget at all, we even don't have a permanent house to live in, we only rented a house owned by the hospital. we live in a city like environment. the point is they are both doctors so my expectation on them must be like a doctor's' status.

I’m worried ever since about my parents that they are not treating me to be a normal adult because they’re blinded by our religious teachings (fanaticism) and forcibly applying it to me when I’m really not into it because (mostly it will not improve my future because it hinders worldly norms that also affect my acceptance in work, friends, family in the future ), it really affects my attitude and my whole view towards them (full of negative thoughts and estrangement) in which I can’t cooperate because i know it's still useless to cooperate with them because their belief is fixed and closed minded.

They always criticizing me because in their mind I’m doing the wrong things (against our religious views) in which i did not do any major wrongdoings and I’m not interested do any of those wrongdoings, I’m old enough to know what is right and wrong,
I’m just trying to be normal, in fact they’re treatment (ever since I’m young) did affect my personality a lot and I’m afraid of the outcome in the future. For example my passiveness, Lack of social interaction to others, Anxiety, stress, avoidant personality and Frustration. many more to mention. I lack in social life because my parents are anti-social but i have few friends. my parents are too strict about social life they want to incorporate religion in my social life because of this im afraid to make new friends because i'm afraid what im gonna say to them about my parents and i'm afraid that my parents will judge them.

I actually realized that my education (my habit of study) during my high school to my college years is really affected by their attitude towards myself which is why I’m having low grades. I’m not interested in studying at home because the aura here is discouraging. They said "in the future all this education thing will be all useless because God will already be coming back and life and work here in earth will be useless" unless I obey my parents will to become a “missionary worker” which I don’t like and discourages me subconsciously to continue studying. by the way i graduated college in a low standard religious school, they chose over a low standard religious school over a higher standard government school? what kind of a highly intellectual parents are they?

There is a barrier in our relationship with my parents because they're trying to set a pessimistic argument in what i'm doing, which I can't talk back because they're trying to close the statements so no openness in my own views and opinions (just like communism works). I think they don't want me to talk openly to them because for them openness means freedom for me which i oppose.

My health is also deteriorating because I feel I’m stressed/pressured all the time. I’m not getting stout even I’m eating allot because of this. I loss weight faster than gaining. At home they want me to be vegetarian, for me its ok but I need the essentials like meat, cheese produce for protein and fat so that I can gain weight faster but they are trying to disapprove what I want too eat. (more like "jewish diet" no oil, mostly no salt, no dairy, pure vegetables mostly raw, bland beans and unsatisfying drink)

I’m not in rebellion or the like but I just want to have a positive normal life which I’m hoping for someday to happen because it’s a struggle for me everyday in coping up if this will be happening all of the time.
Suppose to be parents must be the one that will bring happiness and success to their children but their not doing so, they are too passive and doing it in reverse ( degrading me ). why are they doing this to me, is this normal? this is really not normal for me i just want an advice.