Hey I recently bought crysis 3, I bought It mostly for the singleplayer campaign but then i realised how fun the multiplayer was. I started playing multiplayer about 3 days ago and I noticed today that I never get any Xp after a match, therefor im still stuck on level one. I dont know what im doing wrong I always do the objectives and I get a fair amount of kills. please help me.

Probably you are playing on unranked servers. Make sure you only play on ranked server in order the gain xp and level up. You can use the server browser's filters to get only ranked servers listed for you.