Fiona, from Bolton, Greater Manchester, said: "My huge breasts have ruined my life. They have affected everything.
"My self-esteem has hit rock bottom, I can't find any clothes that fit and can't wear the same things as people my age.
"I have terrible back pains caused by the weight of my breasts. I can't hoover or sleep properly. If I do washing up I have to take a break halfway through because the pain is terrible.
"I find it difficult to go out in public because people think I've got big boobs because I look fat. Some people have even asked if I have had a boob job as they're that large."
Fiona was diagnosed with macromastia - a condition that causes abnormal enlargement of the breast tissue - in 2015 after spending years wondering why her boobs were so large in comparison to other girls her age.
The condition has left her with discoloured breasts that are covered in painful sores and rashes.
She said: "From the age of 10 till just past college everything I wore put my boobs on show. When I was still in primary school I was a C cup.
"I'd be called a 'slag' because it always looked like I was trying to show them off but I wasn't, I just wanted to wear the same things as other girls."
"The pain sometimes can be horrendous.
"I once got really terrified because I was getting in the bath and I looked down and my breasts were purple.
"People say 'I wish could swap with you' but I say 'you don't,' they're ruining my life.
"I once went to get a bra fitted and I went to the changing room and the lady in the fitting room turned to me and said 'we don't do your size'. It was very, very upsetting."
The pain Fiona suffers from her breasts means that she can't even sleep properly.
She had always had an active lifestyle in her teens and early 20's but now isn't able to go to the gym because of the pain she experiences from walking.
She said: "When I'm in bed it's like I'm suffocating. I can't lie on my front because they're too heavy.
"It's like having a huge weight on my chest. Getting to sleep can be a real struggle sometimes.
"In 2013 I used to go to the gym and I weighed just seven-and-a-half stone but since my bust has continued to grow it has been impossible to work out.
"My boobs just didn't stop growing and just got bigger and bigger and droopier and droopier.
"If I wanted to wear something the same size as other girls I'd have to get it at least five sizes up so the clothes would at least fit.
"It's affected jobs that I can have too. I used to work in retail but I can't stand up for long periods of time now so I need to have a desk job.
"I can't even go on a walk, if I go on a 25 minute walk I'm just in absolute agony.
"I want people to understand how hard it's been, I've put weight on because I can't move properly because my boobs are so large. It's a vicious circle."
Fiona recently became a mum to baby William in November 2018 and said her boobs have even caused her problems when dealing with her newborn.
Desperately seeking life-changing breast reduction surgery, Fiona claims she's unable to get the operation on the NHS meaning that she's raising £5,500 on GoFundMe.
She said: "I can't hold my baby close to me because my boobs are so big I can't even see him and he could suffocate.
"I wasn't able to breastfeed him as a baby. I was terrified I was going to suffocate him because I couldn't hold him properly because I was having to hold my boobs. I couldn't even see his face.
"If I had the operation I'd feel like a new person. I'd be starting life again, I'd be able to go shopping for blouses and clothes I've not been able to wear.
"I've considered moving to have the surgery because it seems like there's no other option.
"Having the surgery will give me the ability to live normally."
A spokesman for NHS Bolton Clinical Commissioning Group said they were unable to comment on individual cases.
You can donate to Fiona's campaign here: https://www.gofundme.com/4mbqu-life-changing-breast-reduction