It is good to play tight, especially when first learning the game. But what do you mean by tight? We have to know more about your opening ranges. There is always a delicate balance. Like what is said above, we need to have more information.
You may be to aggressive post flop. Once again, you need to expand on this. But be careful, because to much aggression can put you in a lot of trouble. For example, at live $1/2 games people get married to big pockets. They give me good odds
to see flops when they are deep stacked, because I know when they hit they are going to raise off all their chips.
What you may need to work on most is understanding peoples hand ranges and how to adjust accordingly. There are many great books and instructional internet sites. Study the game, understand more, and your win rate will increase.