I feel numb or sad but only around my family and not my friends why is this?

Because your family may have expectations from you but you feel more at ease with your friends. Friends are usually at a similar age so may be more understanding as they may be experiencing similar feelings. Sometimes it can be easier to speak to friends as they’re is a different level of trust, where as sometimes it may feel like family members are a lot more judgmental. I personally find it easier to open up to friends as they are a lot more understanding and have been through similar experiences. Plus some families are really close and it can be a wiser to be yourself around friends without the fear of judgement.