OP, I am a lot older than you and had my first mortgage as the sole borrower when I was 26. No husband, however many years older than me, would be able to pull the wool over my eyes, or persuade me to live with him in a house without full transparency about an existing mortgage. Why was financial independence important to me? Because as a child I saw my dad handing over housekeeping money to my mum and it felt odd. Then my dad died young, my dad hadn't written a will, my mum understood nothing, she allowed the solicitor for the family business to act for her, and got shafted by my uncle. I learnt from that and have experienced no financial calamities as a result.
My DD is now 22 and I have been saying to her for several years that financial independence must always be a priority for her because you never know what life is going to throw at you. She likes to mock me by pretending she is going to become a trad wife. The lesson has gone home though: she's got herself a financial adviser, invested money given to her when she reached 18 in a high-interest cash ISA, opened a lifetime ISA so she can buy property sooner rather than later, tracks her income and expenditure on a spreadsheet, and knows the financial situation of her boyfriend-likely-to-become-husband - salary for his first job and other benefits, car finance, and savings.
So financial knowledge is vital for you so you can operate independently if you need to, and also so you can teach your children good habits, especially daughters (if you have them). Knowing the loan-to-value ratio of the mortgage on your home, the term of the mortgage, the interest rate of the mortgage, your household's total income, the savings you and your DH have between you, your household's monthly outgoings, whether there is sufficient money left over at the end of each month to invest, whether you could splurge occasionally, is basic stuff. You are living in a fog of ignorance, OP, and enabling your husband to keep you there. But you could make a different choice, insisting on full disclosure on finance and your husband's employment contract, and an equal partnership in your marriage.
Make a start and buy yourself a copy of this book as a first step: https://www.amazon.co.uk/Personal-Finance-Dummies-Hannah-Smith/dp/1394354509.