opening-up

Hi guys, I’ve been having this problem for a really long time now and bits costing me points during matches. Whenever I open up from backhand or forehand I tend to panic and start slapping the ball, I’m not playing proper shots. I’m all panicky and tense on where the ball is going and I’m now afraid to open up. When I play defensively people start attacking me and I lose all co fidence in my shots. I play close to the table to keep in mind. Do I need to change anything on where I’m placed? Thanks