<human>: Summarize the given text in a few sentences.

So I had a conversation with my parents about a new job I'll be starting pretty soon. I was sharing with them about how I felt a little insecure and was very nervous about maybe not being able to do well in this new thing. 

At some point they started saying very harsh things like, "you're in university and you're insecure about going as a cashier ? What? " "well, if you think you might not be able to do it just give up already".. 

At some point they finally get me to cry, and as every I cry in front of my father it gets him kind of mad and tells me "jeez, get over yourself". 

Until I started crying all I was trying to do was explaining them why I felt anxious about starting a new job (I do have valid reasons, usually I am excited by a new job!)... When they made me cry I just decided to remain silent and was done trying to talk about anything with them. 

How can I handle these situations ? How can I not let them get to me that way so I don't cry and feel shitty ?
I'm 22 years old, they shouldn't be able to make me feel like this now, I don't believe I have self esteem issues either..

Maybe worth noting, I have issues with anxiety and depression, I am medicated for the issues and my parents are aware of it. 

I don't understand why they are treating me like a failure when I am totally the opposite of it. I've always worked part time jobs, always had straight A's basically and I'm on my way to vet school next year. Though my father always seem unhappy with what I do and always have negative things to say. But I hear, from my mom, that he is proud of me but he will never tell me or in extremely rare occasions (like a graduation) .
<bot>: How can I not let them get to me when they start saying harsh things so I don't cry and feel shitty afterward ?