Feeling ignored

Me and my boyfriend have been dating for almost 3 months now but we've been friends since middle school ( I graduated this year) and I always feel like he's ignoring me we work together and sometimes it feels like he is talking to everyone but me. Sometimes he gets mad at me over little things. And sometimes I feel like he does things just to annoy me even after I've told him a bazillion times not to. What should I do?