I'm sorry to hear this friend. You sound like your stuck in a hole.

Advice I would give to you is difficult to take and I think currently, right now in your mindset this minute, right after making this post which recaps everything bad that's happened to you recently, you will have difficulties applying the advice I'll give. But I'm sure that tomorrow or once you've been distracted by something else you can start to take a different angle on the things that have happened.

By the sounds of it, some of your problems are making your other problems seem worse. Not talking to this girl you see around is making you lack confidence which is making you have less confidence in your self esteem which is making any criticism you receive feel like a personal attack on you.

All the bad things that are happening to you are amplifying each other. "The downwards spiral".
So my advice would be to say fuck it. You know you've put hard work into your film and your proud of what you've done so far. Lecturers only see your project for seconds before passing judgement so you have to do it their way unfortunately - however that doesn't give them the right to have a go at you if they didn't make it clear what they wanted. A teacher who gets frustrated with their student is one that doesn't teach very well. (Why would you want to please a bad teacher - doesn't that just mean your work is at their standard).

Anyway, back on topic. When I say 'fuck it', I mean give mind a vacation from the bullshit you've got at the moment. Try to go do something, anything that's going on or that you just want to do. Most helpful is to try something new or to talk with a friend you haven't spoken to for ages (we've all got em). Whine to them. Ask how they're doing.

The immediate problems you've mentioned here is that you've been told your films not what's required. The bitchy girl and the one you've yet to approach are things that are either out of your control or you can leave to a later date. Life really isn't short (in my opinion) so don't feel that all of your life can be sorted out in one day. I reckon time will make some of these problems go away. Perhaps not your PMO troubles, but once you make progress on that side of things then you'll be spiralling upwards rather than down.

I don't know if this is applicable here, but I had a depressive state about 5 weeks back. Similar to what your in now (depressed and work/bitchy people piling on me/lost in life and not keeping to my goals). I found that forcing myself to post on here every day made me feel a bit better. Even if it was late or I really didn't want to. Just reminding yourself of something positive everyday can overpower reminding yourself of something bad every day.

I hope that helps somewhat - if you ever need someone to talk to please dm me.

Life's about self satisfaction anyway, not grades. If you can be happy with what YOU have done then I reckon your the real successor.