Sitting down at a poker game should be something you always want to do. Some players go into their games feeling uneasy about the money they are putting on the line. Feelings like these can cause a player to play tighter than they should. The same goes for feeling over confident. The point is that how you feel and what is on your mind correlates with how you play.
If a player is too timid then they will be bullied by the other players in the game. A player cannot be afraid to go in on a big hand. After a long run of timid play you will be pinged by other players as a person who only plays when they have good cards. Remember that poker is a very thought oriented game. It is key to be able to read your opponents. If a player comes to the table with a lot on his mind it will certainly show to the more experienced players.
If you have a tendency to be afraid to risk a lot of money then you should stick to the low limit games. You should also not play with money that you cannot afford to lose. Worrying about losing money that you need will affect your play considerably. You should never gamble or play poker with money that you cannot afford to lose.
When sitting down to a poker game your mind should be clear and free from all distractions. If you find that you are troubled by something, and you cannot get it off your mind, you should not play. Remember that, for the most part, it is a game aimed at making money. Keeping your mind clear will help you make the right decisions.