It happens sometimes. Normal.

It is erectile dysfunction which can have many reasons like medical problems or psychological

Threr r many reason for loosing Erection, in between. This is situational. If u r married and ur partner is cooperative, keep on trying. No need of medication or treatment. Ur performance gradually improve.

There could be several reasons. Most of them psychological. Need to understand properly

Hi You can not ignore other talks n sleep. If ur in a common sharing Room, first build a great relationship with them. It should be very friendly. When they talk it should not be unpleasant to you. Next sleep is part of life. People can sleep on the bed or on footpath. If u like to have a pill or make some ground rules for ur hostel room.