I'm not sure how old you are or even what you do, but if it helps I'm 25 & for me, life is sadly, all about working 5 days a week 'office hours' & it probably will be for some time! In reality, taking into account doing Pete pre & post work, my days are more like 6am-9pm, without the days I work extra hours or take work home. I've had to start at the bottom of my company & work my way up (graduating in a recession was a shock, I'm telling you ...!) - that was harder, as it was rubbish-y jobs, but I'm in a fairly decent position now where I've made my own role & I can get on with it.
It's really, really tough & fitting everything in can be a logistical nightmare - but it is life, for most people my age.
I fully admit I'm working to live - I'm so lucky I've got a horse (well, most of the time - I do occasionally add up what I spend & think 'really?!' & convert that to non-horsey things) but hey, he's cheaper than therapy!
But, realistically, I've got a horse, a car, I pay rent at home & trying to save to move out in the next 12 months so can't afford to not work. Boring my job might be, but it's life.
In this day & age & job market, I'd really suggest keeping at it. Having a decent job on your CV that you can show progression & improvement in looks really good & does give you more freedom of choice in the future. Some of my friends, are still stacking shelves in Tesco or waitressing (there's nothing wrong with either of those jobs - but in 10 years time, I wouldn't want to do either of them just to have more horse time now).
You do get used to the boredom to some extent - it's always harder at this time of year when the sun is out & you'd rather not be at work, but the security & benefit that working brings, outweighs it.
I admit, I live for my weekends (I find using my weekends wisely, helps with the boredom of a full time job as it gives you something to look forward to) but it gets easier to suck it up, I promise. Three months isn't that long to adjust to a new job or routine.
For sure, I'd rather have more time with Pete - but you make the time you do have count. Same with socialising & boyfriends - you make time. Yes, it sometimes means lunging at 6am as I know I'm out for a date straight from work or going to bed at 9.30 as I'm knackered from a day of meetings, reports & difficult clients & last thing I want to do in the middle of winter is muck out after work in the rain, dealing with a horse on three legs doing his best to eat his poultice or that is too fresh from staying in due to bad weather & I'm the only one at the yard.
But, do you know what, it's worth it.
I couldn't earn the money I earn doing part-time work or relying on tips or whatever else. I'm not even that career driven or money orientated, but it does pay my rent & it does make the world go by.
I've probably gone against the grain & I do understand how you feel - I'm there at least once a week - but it would be my advice
x