Cambridge offer holder stress (tw)

Hi, I was just wondering if anyone had any advice for me.
I recently received an offer for English at Cambridge, but I don't know if I can make the grades. I know that I have the ability, but I'm finding it so hard to function under the pressure, stress and loneliness. I've often s3lf harm3d around stressful academic periods but its honestly just getting continually worse.
I'm having to rewrite my English NEA in a very short period of time (my original argument was fundamentally too complicated) but I can barely get started because I feel so hopeless. I've tried telling my teachers that I'm finding things a bit much right now but understandably they're still being strict with coursework deadlines, and I can feel them disliking me more and more as I keep asking for extensions etc.
I also don't really have anyone to vent to because the only 2 people I'm close enough to feel comfortable doing that with are both struggling themselves with su1c1dal ideation etc so I can't really put more on them. Being worried about these two is also contributing to my stress.
I also feel very lonely- I've drifted from nearly all of my friends, despite me reaching out etc. I would tell my parents but my mum isn't very emotionally stable and I know she'd take it very personally and have a bit of a breakdown if she knew I was struggling, and having to witness her crying more than she already does would honestly make things worse.
I know that I need help but I don't know how to ask without feeling guilty for taking up a counselling space at my college when I know of many people with genuine mental illnesses at my college who need it more than me, who has no mental illness but is just very stressed. I'd also just feel like I'm seeking attention.
I know this sounds completely whingy lol but I feel a bit like I'm drowning and yet still desperately want to achieve my offer. I don't want to give up.

It doesn't sound whingy, sounds like you are feeling under a lot of pressure, it's affecting your mental health and you don't know where to turn. It sounds like it would be really sensible to get some help before things get worse. If you don't have anyone else you can speak to then reaching out to the college counsellor is a sensible thing to do. There are also confidential support services like SHOUT where you can speak to someone and get advice. Google: Giveusashout for more info. Or text SHOUT to 85258

Hi, I'm at Cambridge for undergraduate and remember how horrible the pressure is regarding the grades. I had such low self esteem that I was seriously expecting not to attain my offer grades (A*AA) and letting everyone down. But as someone who has come out the other end, you really do have it within you I promise. It is an incredibly difficult time but you got the offer for a reason. The best thing I can recommend is getting yourself excited about your backup uni choice as well to alleviate the pressure. My backup was a London uni, and I was partially hoping Cambridge wouldn't accept me so that I could live in London. Not getting the grades absolutely sucks (I have friends who this happened to) but its not as black and white as you think - I have known people to get into Oxford and Cambridge having missed their initial offer. I do think its really important you talk to someone about the mental health concerns you are having, you aren't wasting anyones time! If a friend came to you in the same situation you wouldn't tell them they dont deserve help because they don't a 'real' mental illness (which, by the way, isn't a straightforward matter of having vs not having one). I also have had times where I am unable to talk to my family (similar situation to u) and getting therapy really gave me an outlet for the things I couldn't say, the stress at home gets to you more than you may now realise. Please don't give up, it seems so insurmountable now but you are capable of achieving the things you want to do, good luck and take care of yourself