When shopping for something like a car, or a computer, or a large TV, there are things almost no one says:
1. "Man, my computer is just too fast!! I am really sorry I spent the money on the faster one"
2. "Wow, my TV is just too big! (although this does get said sometimes by people who have significant others who dont think there should be a TV at all in the room that the TV was put in).
3. "There is just too much range on my EV! Glad I got the one with the shorter range"
There are reasons for purchasing the slower / shorter range / smaller product, but in general, people would be served with buying the one they can AFFORD, not the one they think they need. Thats not a hard and fast rule, for sure, but in general, when you have a faster computer, you know you can pretty much do what you want with it, and not be limited by the device.
Same with EVs. most people would likely be better served with buying the longest range EV they can afford, and if the choice is shorter range and autopilot, or longer range and no autopilot right now, since tesla lets you add autopilot after the fact to me there is really no contest. It should always be the longest range battery first, then other options after that.. unless you live in the city and never see driving out of it, or the tesla is a second car that will only be used to commute to work and back or something.
I would give this advice to any first time EV owner (like me). If someone is an EV vet and already knows how their life changes or not with EV usage, it doesnt apply. The single biggest hangup most new EV drivers (like me) is "how far can I go before I have to charge... and how long will charging take, and where can I charge?"
Its my belief that never really goes away, not yet at least. We see road trip summaries all the time here by someone saying "I went from XXX place to YYY place in my tesla and it was fine! I stopped at ZZZ, AAA, and BBB". No one gives a road trip update talking about what gas stations they stopped at, but because there is still "worry" about "where can I charge" veteran tesla owners try to show everyone "hey you can do it!" by these posts (which are appreciated by the way).
We will KNOW the charging infrastructure is ubiquitous when people talk about their road trips in an EV and dont memtion where or when they charged once. When that happens regularly, we will know that no one is even thinking about the charging aspect... but we are not there yet.
until we get there, one is served by buying the longest range EV they can afford.
OP if you are still within your return period (so wont lose money), you should hurry back to tesla and try to buy a long range model 3. Especially since you live somewhere cold, you are looking at severe losses during the winter time, and you get real winter, unlike I do. Also, you have this concern NOW, at the beginning of your ownership. Next winter, this will eat at you, and you will be focused on the range number so much it will probably make you upset.
if you DONT have the choice to return it and exchange it, then just know that everyone is right, you CAN make it anywhere you really need to, you just may need to charge more than you expected. Change your mileage left to PERCENTAGE instead of range. Thats the single biggest thing you can do to help yourself get over focusing on the number. Your range anxiety will lessen with usage (it generally does for everyone), but since you have not gone through your "real" winter yet, it will return when you go through your first winter. You will get through it either way... I just think if you CAN (and can afford it) try to get an in stock long range one. You will likely never be sorry you had "extra" range even if you dont use it much.