At 27 time is definitely not ticking, so you can banish that thought right away.
I found myself feeling shit about my life at around the same age as you. The only thing that helped me to snap out of it was to work out where I want to be and by when, then work back from that and follow an actual plan with realisatic goals and a series of milestones along the way.
In your shoes, I'd push aside any relationship goals (and I did when I was in your position) and focus on career and house goals. You can do this, you just need to break down those huge, possibly overwhelmingly big desires into smaller, more manageable bite-sized tasks. No better feeling than ticking off tasks and knowing you're one step closer to success.
Just to add, when I started actually getting somewhere with my career and life in general, I became happier in myself and realised I didn't need a man. And it wasn't till I was genuinely happy and fulfilled on my own that I met my wonderful DH - it all just kind of fell into place after that. I'm only a few years down the line now, so it hasn't taken long, I just needed a clear focus.
You sound like you've got definite ideas about what you want, you just need the confidence to believe you can do it and the motivation to take steps towards making it happen. No-one can do it for you- grab a pen and notepad now and start making some lists. You've got plenty of time to make some huge changes!