XX621 you will, hopefully, realise that there are a lot more happy souls than doom and gloom merchants in the industry. Certainly in my experience. The problem is that the doom and gloomers tend to be a touch more vocal. So good on you for asking the question.
Do I have any regrets? Maybe, sometimes! Not being able to go to your mates birthday because you didn't book it off 6 weeks prior. Couldn't get leave at the same time as your missus etc.. If you have an understanding family (most of mine are involved in this industry in one way or another) then it's not too much of a problem and eventually will become "just one of those things".
It WILL all pale into insignificance, however, when you break through the minging grey overcast at 5 am into the clearest, brightest, sunrise you will ever see. Ray Bans on at 5 in the morning, not many people get to do that
It WILL all pale into insignificance, however, when your engine goes BANG just at the wrong time. Then you get to do your job.
So yes, there are negatives but in my opinion the positives far outweigh them.
Be prepared to be scared ****less (occasionally). Be prepared to be continuosly assessed. Be prepared to be challenged and be prepared to be prepared. Phone calls from (s)crewing at 4.30 am, you've got to go and nightstop somewhere so cancel you dinner party. Get stuck down route so cancel your dinner party. Delayed somewhere so you can't pick the kids up from school and you have to cancel your dinner party.
That's the reality. Would I change it? Nope. Would I do it again? Yep.