Pretend you have to play a game with the devil. Your life is on the line, all of your greatest hopes and dreams, but you get to choose what game you play. You need to stack every available advantage you have: it must be something you are good at (or can get good at), it's gotta be something that you enjoy enough to continue with even when the going gets tough, it needs to be something that other people will validate your efforts with (if that's important to you). And then you have to make a choice and pursue it with everything you can muster. You're free to change the game whenever you want if you find it's not going your way - that's fine, and a very good strategy when the situation arises. But the most important thing is just to make a choice - indecision is the devil's favorite game.
Its just a matter of deciding what's important to you. All you have to do is be aware of the costs, benefits, and risks of taking particular courses of action. Then, just make a decision and never look back.
Also, I feel like the origin of this 'style' of question is essentially rooted in self-validating excuses for why one is choosing to do something they dont 'want' to do. Mind you, I dont necessarily mean your question specifically, but I've heard plenty of variations on the theme in my life.
What I've found myself thinking an increasing amount about it is: I'm pretty sure that the majority of the time, people expressing this sort of question are basically looking for an excuse to fail. Maybe it's out of some bizarre romantic ideation of "realistic pessimism". Maybe it's so that they wont feel as bad for never trying in the first place, out of fear that they might "fail" at this thing they "love so much", and so they want to displace the responsibility of their own lives onto someone else. That way, they'll always be able to say 'oh, well I WOULD have been great, but I was held back by my feelings of duty to *person who will help validate this decision* '. And honestly, I think a lot of the time it's just a load of horse shit.
Think about it this way: imagine you are informed that you have one year left to live. Oh, well the rush is on now, isn't it? Now it's suddenly time to start checking boxes on your bucket list, right? Now it's suddenly time to start living your dreams, the life you REALLY wanted to live all this time, but couldn't because of *reason 1* and *reason 2*, oh and dont forget *reason 3*. But now that the reaper is on your doorstep, suddenly you realize those things dont _really_ matter anymore, so suddenly you're "free" to do what you "actually want to".
See, but here's the thing- that stupid thought-experiment might be closer to reality than you think. Unfortunately, we don't yet live in a hyper-technological society where spontaneous accidental death has become a thing of the past. People half your age are being diagnosed with terminal diseases on a daily basis. There's murder, car accidents, slick floors and hard corners. Yeah- the actual probability of you suddenly kicking it is probably pretty low. but I promise you that it will only grow higher with each passing day. So what I'm trying to get at is- you have to ask yourself: do you REALLY have time to be doing anything BUT exactly what you want to do with your life?
Now don't get me wrong - I'm not saying that it's some horrible sin against the human spirit to reflect upon your options and decide that what you originally /thought/ was thing you ReallyWantedToDo Inc. is in fact not actually what you want to do, and to instead opt for a different path in life. That's totally fine and completely valid. I know a good number of people who have taken exactly that road in life. What I AM saying though, is that if deep in your heart, you KNOW you know that this is what you Truly, Madly, and Deeply want to do, why would you let anything get in your way? If this was exactly THE_THING that would serve to give you the most personal satisfaction in life, is there really any material fortune that could compare? Or better yet, if this really was your OneTruePassion (tm), what lengths WOULDN'T you go to in order to find a way to make it a reasonable and sustainable life choice?
All I'm saying is- if you truly NEED to pursue this passion of yours like a drowning man fights to fulfill his NEED for air to breathe, there's really nothing that can stop you. Or at least, even if there's some bizarre act of god and a meteor hits the Earth tomorrow and kills everyone, you'd at least be able to think to yourself that the only thing capable of getting in your way was literally a 500km wide hunk of rock traveling through light-years of space with pinpoint precision to put a stop to your unrelenting pursuit of your greatest dreams.
I, for one, can't think of much that would be more satisfying than that.
"Engineer" is a pretty broad title. Can you want to specify a little more? Civil/mech/ee/etc are all very, very different positions. Are you trying to decide between a specialty? Perhaps it would be enlightening to know why you want to be an "engineer"