If you are doing this only because you can make more money doing this than other things that you can find then I don't think that avoiding burnout will be likely.
I use two things to stay invested, one obvious, but the other maybe not so much.
The first is that I avoid negative people, those that don't share my professional/moral/ethical ideas surrounding EMS, and seek out those that do. I don't dislike those that don't share my ideas, I've just gotten old enough to realize that I just simply don't have the energy to be who I'd like to be in EMS while allowing them to suck the positives out of every shift. It's not always easy to do this, but with the internet age I've found that even when I can't find people that I respect to hang out with physically, I can always do so mentally and emotionally online.
The other, and this changed everything about me as a paramedic, was realizing that I rarely make big, obvious physical changes in patients, but that I can sometimes make small, emotional, mental changes in them. I am less motivated by the dramatic change in a patient's condition after pushing D50 or Narcan than I am in that moment when I see the shock on a lost, confused face after saying something akin to, "I need you to listen to me for a minute...this is important. Do you know why? Because you're important..." The look that seems to say, "Wait..you can see me? Everyone talks at me, but I'm not sure what to do when people actually see me..." Old people, drug addicts, fake suicides, drunks...If I can see that look on their face, I feel like I've done something important. I probably haven't, but it's what makes me excited, and reminds me to slow down, on every patient.
You've got some really cool posts here. I know that you have an amazing spirit, I think that maybe you need to take a new look at each person that enters your ambulance. I think that you'll see that on every single call that you're making a positive impact, or a negative one...Almost never will you be neutral, despite what others try and convince you. If you're not touching people's spirits then maybe you're not the provider that you'd hoped that you'd be...but today is a new day, right?
Professional help is always a good idea. I've sought help on many occasions in my life and each time I've left with new tools that made my life better. And, though it makes sense to you now, it's silly to think, "I don't even know where to get started talking to a stranger..." That's why you go to a professional. Would it make sense to you to hear your patients say, "I didn't call an ambulance because I didn't already know what they would do..."?
As with most things, starting sucks, but this is exactly the right time to get after it Babe...
Good luck