Paladin and it's party

Me and a couple of friends try to move away from DnD 5e to Pathfinder 1e. I decided to play a paladin. Honestly, the possibility of evil paladins in 5e or not demanding oaths were very irritating for me. So, an always lawful good paladin in PF looked kinda great. But (from our DM's tip) one of the players decided to play for a lich (template). While we play Pathfinder, the campaign is in the Forgotten Realms. That player tries to convince me that his lich won't be evil, but neutral and I kinda don't buy it, more for the reason of what the player (and DM) consider evil and what I do is kinda different. I am much less "grey morality" tolerant. But it would be a bad player etiquette if my paladin would start fighting the lich. So I am uncertain. I was really enlivened to play the paladin, but a lich in a party seems like a red flag. I was quite dumped to learn about that. I don't want character conflicts, so maybe I should change a character? Or leave the table all together?

Me and a couple of friends try to move away from DnD 5e to Pathfinder 1e. I decided to play a paladin. Honestly, the possibility of evil paladins in 5e or not demanding oaths were very irritating for me. So, an always lawful good paladin in PF looked kinda great. But (from our DM's tip) one of the players decided to play for a lich (template). While we play Pathfinder, the campaign is in the Forgotten Realms. That player tries to convince me that his lich won't be evil, but neutral and I kinda don't buy it, more for the reason of what the player (and DM) consider evil and what I do is kinda different. I am much less "grey morality" tolerant. But it would be a bad player etiquette if my paladin would start fighting the lich. So I am uncertain. I was really enlivened to play the paladin, but a lich in a party seems like a red flag. I was quite dumped to learn about that. I don't want character conflicts, so maybe I should change a character? Or leave the table all together?