Italianjon
Whilst you are under the care of an instructor, follow his advice. But the issue here is the lookout.
In gliding, that is the constant theme of all flying in gliders - keep a lookout. It's what power pilots are especially bad at doing. The normal cockpit layout is very poor and doesn't help - with my xx hours looking through the PA28 'letterbox' I can swear to that.
But gliders are used to flying in close proximity to other gliders and so a lookout is life-enhancing.
I despair when I read on these threads about pilots relying on TCAS and ATC instructions - they should be listening and looking out and taking avoiding action earlier than later.