@rakan-le-rouge Sorry to hear about your experience.
Here are some strategies you could adopt to help with pirates who kill for the pleasure:
1 - If you plan to play for a few hours and undertake some missions, start by checking the map for Reaper flags. Maybe start on a simple mission to get a feel for the server, how many boats are there and if they are friendly or not. Once you are happy you're on a somewhat peaceful server you can get on with the missions without fear. If there is a bit too much action then just restart the game and hopefully you should get better luck. Some servers are hostile but many are peaceful.
2 - Join an alliance. This assumes you are on a friendly server to start with, but will add a small guarantee of safety. On the other hand, pirates will be pirates so don't trust your new friends 100%.
3 - Learn to improve your sailing to avoid getting run down by other pirates. Part of this is also to start with the assumption that any ship on the horizon might attack in which case stay upwind and keep those sails trimmed for maximum speed.
4 - Take any death as a lesson that you need to get more experienced yourself at PVP. I used to get upset about it but if I get killed now I just say "Thank you for making me a better pirate" then try to get improve next time. Not a good option I admit but it works. By not getting stressed out about it I've actually improved in combat and although I'm not a super PVP I last a lot longer these days and can normally take down one, two or sometimes three pirates before I die. Knowing there is always room for improvement actually adds to the enjoyment of the game.
Hopefully these suggestions will help.