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Well some people are shy from the starting of their life which is not at all dangerous but at times you would be able to see that some people are extremely shy that convincing them to come in any gathering is next to impossible. In the process of convincing them you might even have fight with them which sometimes force them to look themselves inside a dark room. The reason behind not attending any gathering is that they feel that they are not perfect rather they feel that they are too ugly that no one would want to talk to them or maybe no one would like them. In case you see someone reacting too much on getting forced to attend any gathering and the reaction is way too much then it is the time to take that person to a good physiatrist and get treatments done.
Desire of personal and close relationship:
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Though it is true that they hate interacting with people and talking to a stranger scares him but they always carry a desire of having a deep relationship with a person. Person who suffer from such disorder always tend to be over possessive about their partner and it is not always about their partner rather they also become jealous when someone else speaks with their best friend or even with their parents. You would see that people who have such disorder often cares way too much and tries to be perfect for the one they love. They always feel that people might replace them which scares them the most and that is the reason they always stays with a mental depression. They feel that are not perfect which make them feel that they are easily replaceable as well and after a while people won’t like them anymore. This situation though is dangerous but this can be sorted with small as well as long conversations. The person they love the most can convince them for almost everything which might help them in coming out of depression.
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Anger is common in this matter but they rarely would fight and get angry on people so they choose to abuse substance in order to make their mind calm. In fact they even hurt themselves at time when they become extremely angry which becomes unbearable. They always break thing or punch on hardly on things or wall and you would even see that tearing up things brutally calms them down.
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Getting avoidant personality disorder test is the best idea before heading towards the treatment and fortunately there are lots of treatments available in present day but the disorder cannot be cured at all though the symptoms can be controlled. Meditation, deep talks etc are the best way to pull any person out from this state of mind.
These were few symptoms as well as treatments of avoidant personality disorder that you should check.