My social anxiety makes me second guess or overthink when messaging friends on facebook

I don’t really know how to stop i keep saying to myself should i send or not send the message, i have no friends over this , i feel extremely lonely at 33 years old even though i have parents and brother , does anyone have any advice on I can stop overthinking when messaging people on Facebook my anixety is so severe

I have been hurt before by friends who ask to to keep in touch only to to be told we aren’t actually friends or just dump me for struggling with social anxiety or just ask me to stop talking or messaging makes me not want to socialize with anyone