As far as finances can you afford to consult someone, this advice may be available on line or free but if someone (your parents) could buy you a bit of time with a financial consultant for your next birthday, that might be worth it.
Is it not necessary to buy a home or get a mortgage.
However, I do think it is better to get back on the property ladder if you can without bankrupting yourself or making life a real misery!
Rent is (I believe) more than the average mortgage still, so in the long run your weekly/monthly outlays may not be much different (allowing for the fact that any repairs etc may almost certainly need to be paid for by you if you buy, where as rented properties are usually maintained.
So, how can you get that little bit of money together and turn it into a property you can but not rent? I wonder if you really need to be paying back £340 a month, could you pay back less? Yes, I know it will mean this takes longer to repay but are the interests rates on student loans quite good. (Please do check this as I am not sure what they are, this is just what I have heard.)
Would your deposit be a 5% one? If so, this article says you just need £7,500, which is almost what you have. Plus if you are not in a chain for house buying then you may be able to get a reduction on the price because you will be a very eligible buyer, I am sure you know that but I think that could translate into an actual reduction.
This article is old, 2014, but it may have some wisdom. I am not a financial person but I am tenacious and I think there is often a way.
Plus in old age, owning your property will be a benefit, not needing to find the rent, and something to pass onto the kids. I did not get a pension or mortgage until I was in my thirties, so I was late to the table!
www.thisismoney.co.uk/money/mortgageshome/article-2617876/How-mortgage-deposit-afford.html
Lastly, shared ownership may work and also don't ignore housing associations if there is one near you.
My friend belong to one which he got into because he is belonged to an ethnic group that had a housing association. I didn't even know they existed!
He got a small place and was able to move up the ladder when his partner had a baby, and then again when they had another child.
Another friend had a very big house and an abusive husband. They separated and she downsized to a smaller place but I am pretty sure she is happier now.
And it is so great to know you too escaped.
I hope you find somewhere great, whether it is renting now or for longer or buying later. Good luck.