im stuck in the game right now

Hey guyz and girlz, i haven't been playing the game for a month and a half. Yesterday, i logged back in the game. Examined the quests as well as
missions on my quest log. However, can't seem to find which quests/missions i finished.

Following the guyz with exclamation marks on their head but there is no one bearing it around the area. My character has reached the level 15. Then, i
went to the location where Master Saberlin is. My purpose is getting past the Lornar's Pass somehow. It seems impossible since stone throwers and ice impale bitches do not allow me to even with henchmen support.

As far as i remember, the last primary mission of the game had a name like ... White Mantle. Can'T get the next since the man in D'alessia Seaboard doesn't display me anything.

What do you suggest on going through Lornar's Pass and D'alessia Seaboard?

In Prophecies, the primary quests just help guide you from mission outpost to mission outpost -- they are in no way mandatory. If you have arrived in D'Alessio Seaboard, you can just hit the "Enter Mission" button in your party panel.

Otherwise, you could follow the wiki guide to the missions to see where you left off.

ETA: Don't bother with Lornar's Pass. Going south from Beacon's Perch is the shortcut to the end-game area, and not meant for inexperienced players.