

If you mean chapter 14, post Edge Knot City
When you’re taking Lou to the incinerator
You’re right at the end, there’s no more bosses. It’s just a bit of hiking and then a bunch of cutscenes. Then you’re in the epilogue and time rewinds so you can keep playing. Might be a bit of a weird place to start playing again though, as you just boot up the game after so many years just to watch a cutscene or two and then credits roll lol.
If you mean chapter 6, before reaching Edge Knot City
When Deadman takes the baby to recalibrate it
As you can probably guess by the chapter numbers, you are nowhere near the end of the game, sorry. There IS a bossfight, but you only have to do the first section alone, then you reunite and do the actual main fight together.
As others have said, the old monster hunter games are best played as a turn based battle. Take the fights slow. Stay safe and watch exactly what the monster does. Only go in for an attack when you know it’s safe. You might time out on a few monsters the first time, but every hunt you will get faster, as you figure out both the monster and your own moveset. The caveat though is you need to make sure you’re paying attention! Just going by feel will get you wrecked and you won’t learn anything doing it. Always be watching and analyzing. You can spend 10 hours throwing yourself at the monster and get 10% better, or you can spend 1 hour learning the monster and get 50% better.
Another thing to be aware of is that these games are capital S Slow. Fights are going to take forever, and that’s only going to get worse when you get into the guild quests, which are intended to be played with 4 person parties. Singleplayer health scaling was not added until World. If you’ve been wailing on a monster and it’s just not going down, don’t get discouraged. As long as you’re doing damage and not getting hit, you’ve got 50 whole minutes to kill the monster. You’ll get it eventually, I promise. Just keep at it and at some point you’ll break through, and the thrill of having conquered what once seemed so impossible will bring you a rush like no other! Good luck, and happy hunting.