You obviously want to enjoy it otherwise you wouldn't have posted. However, you just dont. Not yet. There is no shame in not enjoying it. I know fast runners who don't enjoy parkrun. I know slow runners who also don't enjoy them. My family like them, but they don't run. They just tag along with me.
Firstly, as has been said, you did a lot better than the majority of the UK population this morning. It's grey, dull and the weather seems relentless ATM, but you still got your gear on and did a parkrun so that in itself is something to be proud of. No-one honestly cares about your time, they are too busy worrying about their own time.
The speedy ones are either hanging about supporting those slower than them (they might be with someone the same sort of time as you) or they have left. They are not hanging around to laugh at you or make you feel inadequate and even if they are then that's on them, not you.
At mine today I came 29 out of 40. Your time would have put 6 people (inc tailwalker) still behind you so not last. This one was hilly, muddy and even my trail shoes had me slipping about and I walked more than I should.
I knew today wasn't a PB day. I knew it wasn't even going to be a good time day (I was 8 mins slower than the last time I did this route back in Nov/Dec), but I just thought about the fresh air I was getting, the fact that I could still go out and there and do it. I really enjoyed it - even though I was very slow for me (nearly 40 mins when my PB is a sub 25). It doesn't matter, it's only parkrun not the olympics. It's just meant to be a bit of fun on a Saturday morning.
So go into it with a different mindset next week. Don't think about your time or that person who you feel should be slower than you. Just look at the scenery, think about those that would have loved to have been there, but can't for whatever reason (work, injury, other plans). Give it another couple of goes, but if you really hate it then accept it might not be for you. Good luck and I really hope you discover the enjoyment as I think you want to.