My husband and I are also both Generation X, like yourself, however, we've got different mindsets to yourself. We have made provisions for retirement. We would seriously lose sleep if our savings dropped below £10k, but they are significantly higher. We've both been avid savers since childhood.
We do not go on a foreign holiday every year, usually would do one on average every 4 years. Do an inexpensive UK holiday every 3 years or so. We do not eat out or get takeaways regularly. We are pretty frugal.
It is much more savvy to put what you'd like to overpay on your mortgage into a savings account (provided your current mortgage interest rate is lower than savings rates are at the moment), then when your fixed deal is up, or if the savings rates fall below your mortgage rate, then use the chunk of savings to overpay instead. This is what we do when we make overpayments and this is the most financially savvy way to overpay.
I'd personally urge you to save for an emergency fund of at least £5k, but preferably closer to £10k. You cannot put all emergency repairs on credit cards, I don't know any tradesmen that we use who even take credit cards. You may get an unlucky year and need a new boiler, repair a gutter leak, repair a garden fence etc., and with being unable to pay for these things on a credit card, you'd be screwed.
Personally, if I were you, I would:
- Open up a good interest rate savings account, such as a regular saver or an easy access ISA.
- Pop your current mortgage overpayment into this account instead to use on a larger overpayment when your fixed deal ends (providing the interest rate is higher than your mortgage interest rate).
- Open a second good rate savings account (you can only pay into one ISA per year, so probably better to use the mortgage overpayment savings for your ISA to take advantage of it being tax-free). This second account will be for your emergency fund savings.
- Consider forgoing your annual foreign holiday and just going every other year instead.
- Consider cutting takeaways down to once per month instead of twice.
- You say you are a humble writer, I'm not sure what type of writing you do, but is this something you could scale up? You could use David Gaughran and Matthew J Homes for self-publishing advice and scaling up advice. This could potentially increase your earnings.
I think where your mindset is slightly flawed (in my opinion), in terms of "I consider this a more effective use of my money than saving, which I can't afford to do as well." and "You only live once and you can't take it with you, etc etc." is that, yes although bringing down your mortgage capital is good, it's not the same as having an emergency savings funds for necessary repairs to your property etc. And yes, you do only live once, but you need to be able to afford to fund your life while you are alive and if you splash out on a holiday then your boiler packs up the following week, you're screwed without your emergency savings fund. If you're dependent on using a CC for an unexpected necessary expense you may struggle to pay it back should something awful happen such as you lose your job etc.
I wish you well and hopefully happy saving!!