Do it.
You do not have to be "110% committed, it being the only thing you've ever wanted etc etc". Don't listen to those who talk about taking up spaces that more deserving people could have had. It's your life, do what's best for you.
I only came across the military during the final year at University when looking for a job to go to afterwards. I'd never even heard of the UAS. It sounded a bit more interesting that the run-of-the-mill graduate jobs that I was faced with.
I applied for a ground branch, but ended up as pilot when the recruiting officer said something along the lines of "why don't you want to be a pilot?".
There were times during IOT and fg trg when I seriously wanted to pack it in, but I just said to myself "one more day, give it one more day".
It took 17 more years before I finally said "no, no more days, I'm done".
If you really don't like it once you're in, then leave, but at least you tried.
Don't be the one in 5 years time who looks up at the {insert your favoured type of aircraft here} overhead and thinks "I could have done that".