@feelingutterlyhopeless , I just want to say well done for being so honest and humble on this thread. You are open-minded, genuinely willing to learn, not going on the defensive, and taking it all on board.
It’s not fair or accurate to say you shouldn’t be a counsellor. Counsellors don’t have to have perfect mental health - and your struggles will eventually give you added insight. You are in the early stages of training, so it’s far too soon to decide whether it’s not for you. But even if you ultimately decide to give it up, it seems like the training is helping a lot with your own self awareness plus your understanding of others, so it’s still been beneficial.
In answer to your original question, yes it’s probably you. Even though your suffering is real, not many people can deal with frequent moaning, complaining and “breaking down”. It comes across as if you are self-absorbed. Your friends and family are not your therapists! Please spare them.
It’s ok for people to sometimes share their woes, if they are occasional or solvable, but the relationship has to be balanced with levity, and allowing the other person space to share their own news, interests and concerns. It sounds like you have gained a reputation for trauma dumping, and have used up your whole quota of moaning.
To regain these relationships, you need to focus on fun, levity, and most importantly, the other person. It has been mentioned on this thread before but you seem very inwardly-focused and self-absorbed, so you need to stop thinking about yourself and your feelings so much, and focus on other people and the rest of the world.
A chronic sense of loneliness is associated with emotionally unstable personality disorder, so it may be worth seeking out support groups for this. Good luck with everything, you deserve a good outcome and for your kindness and empathy to shine through.