Primarily my sister. We are incredibly close.
Also a very good local friend.
I can phone or message them when I need support.
I also have lots of good friends who I can open up to in person or via msg.
When I feel really, really low I call the Samaritans, pour my wee soul out, have a good old cry and then carry on. Very, very few people see me in that state. Not because I feel there is any shame in it, it's just my natural reaction.
I appreciated how valuable my sister and friend are while I was away for 3 weeks. My sister is also away on a well earned break and I didn't want to burden her with an issue which was really upsetting me, and it was too long to type out to my friend.
For general frustrations (the sort of mundane things you wang on to a partner about but isn't worth phoning a friend for) I go for a run. I sometimes go for a march walk around the fields and mutter to myself.
I am a lone parent and my support network is vital. I am quite low on resilience.