Super annoyed with one of my coworkers yet again.

I don't think she's trying to do this, but sometimes I say things and her response comes off like she sees me as a stupid, inexperienced child that has no business being her equal in the workplace.

To be fair, I am young and relatively inexperienced - she's old enough to be my mother or even grandmother if teenage pregnancy were involved; she's been working longer than I've actually been alive; and this is my first professional job, though I've done similar work as a student. Despite this, we have the same position and work in a department/on a team where the only person above anyone else is our boss. I'd also like to think that I've shown myself to be good at what I do so far.

Now, she has been responsible for training me to do things I haven't done before, and that's fine. Obviously 2 years of part-time /student-assistant-level work isn't going to match 30+ years of full-time work. I don't have a problem with that - it's part of her job to teach me and part of my job to listen right now, and it'll make me better at what I do.

But that doesn't mean it's appropriate for her to tell me she doesn't trust me to do things when I make one tiny, insignificant, easily fixable mistake.

That doesn't mean she gets to make snide comments about my age when I mention (in a relevant, casual conversation) that I was 11 when the first Harry Potter movie came out.

That doesn't mean that she gets to scoff at me when we're talking about how many job applications business students put out and I mention that the several I did were overwhelming enough - we're in a field in which people used to be able to get almost any job they applied for if they were qualified and in which that is no longer the case (the implication with her comment on this was that I only had to put out so many because I was doing something wrong or am incompetent which is definitely not the case).

Some of it is probably my fault - I'm trying not to be overly sensitive and trying to avoid topics that highlight how young I am. But she's also being inconsiderate at best and downright bitchy at worst. Our boss also has to essentially prod her to actually share her (our) responsibilities with me.

Ugh I'm just getting annoyed. Sorry for the rant.