We can't afford to live together and have children

Molillie

I think that you need to make a plan of action. Money seems such a huge concern to you, and if you really feel at the moment that your job situation is not going to improve, take on something else part-time (anything from Pizza delivery to weekend work if you have a Monday to Friday) You have few responsibilities at the moment, and maybe are focussing too much on possible problems. Keep yourself very busy.
At the same time, think about what you'll do once you've bought. Renting out a room seems obvious, and can help a lot. Before any babies arrive, have a lodger, after, try airbnb or similar once the little one is not going to disturb guests at night. A friend spent quite a lot on decorating for airbnb visitors, and paid for it very quickly, and now makes a decent amount and doesn't have to let the room when she doesn't want to. Overpaying the mortgage as much as you can will help you with feeling secure. Use Youtube for information on decorating, etc., and the OldStyle board here for general help and advice. The Mortgage free wannabe board has some amazing diaries which should help you. If you aren't keen on your job, do you have an idea for something else? Or a subject you'd like to know more about. You have a long time to go before retirement, and also many job areas are changing with the internet and possibilities for remote working. Give yourself a to-do list each day or so, and make the whole thing a project. Keep in touch with the estate agent constantly, so they'll know you are still a serious buyer,
There are also lots of vlogs on Youtube on saving or getting out of debt, and some of these can be very inspiring. Good luck.