definitely this.
its normal to feel the way you do x & I don't want to sound preachy, but...
my life turned out completely differently than I had planned.
i had come to terms with that (broadly). & restructured my work, house & my retirement plans (at 55)..
then had a stroke, which has fucked it ALL up.
Closest friends have lives very similar to how I'd originally planned my life & sometimes I do feel very envious. But I have travelled a lot, worked overseas a lot, lived in different countries & actually not sure what of my life I'd give up to be in a different position now (iyswim)
please try to enjoy what you do have (DH, kids, other people who live you, rewarding job, reasonable wage, enough money to house, clothe, run your car & feed yourselves AND save £500 a month.
if you & yours are healthy try harder to appreciate that i didn't) I can't be an example, but I can be a warning!!
oh & get on the housing ladder! Don't keep waiting for the perfect time or house. Put that money into your own mortgage as soon as possible. It's a secure feeling you can't beat.
financially the stroke has fucked me (& stupidly I didn't have the right insurances) but my mortgage is small (so is my house!!) & I have enough in savings to pay it & bills, for now. No one can take it away from me, I'm not having to worry about a landlord evicting me or putting the rent up.