What is the best way to ingest more protein?

I'm vegetarian and I'm not going to lie, I don't eat what I should be eating. I take a multivitamin daily (If I remember), but there are times when I know my body needs protein and have to go grab a power bar (extreme tiredness, and become "out there"). Even after I work out or do a lot of cardio activity I get shaky. What kind of supplements are the best to take? My boyfriend has protein powder mixes and stuff he uses because he works out. I'm looking for a pill or vitamin of some sort any suggestions?