I am so rigid that I can't joke. What should I do?

I have considered my present job, and I will work for another two years. Because of the current economic situation, there is really no way to let go of this job, because the costs in all aspects are too high, so I decided to stick to these two years and save some money no matter how hard and tired I am. When the children go to school, if I can't go on for various reasons at that time, I can resign again. I don't think it will have much impact on children after two years. I was going to call you on Sunday for interpersonal consultation, but I am very busy these days, so I want to ask you a question first. In daily life, I have a good relationship with my colleagues at work, and several colleagues will get along well. Sometimes I chat with other colleagues and maintain a general relationship. Although I don't belong to the sleek and lively type, I feel that my personality is good in everyone's eyes. I don't belong to that kind of introverted person, but I don't know why, I'm particularly afraid of occasions where several people go out for parties. At most, one or two people with similar personalities are ok, but if my colleagues go out to dinner parties or get together with relatives at home, I will be very scared, because that kind of party requires joking to mobilize the atmosphere, and I usually feel depressed and uncomfortable at this time, because I am a person who can't joke and has no humor. So every time at this time, I am very reluctant to let go of stage fright and even feel inferior. My sister-in-law's son will have a birthday in two days. (It's my husband's sister. ) They called our family to a restaurant for dinner. i really do not want to go. Every time I sit there eating, I don't talk much and don't tease his son. I feel that there is no atmosphere at all. Moreover, although my husband talks more than me, he is not the kind of person who is very active and will mobilize the atmosphere, so I feel very strange every time this occasion. So a few days before every such party, I am very nervous and scared. But I'm embarrassed to go. Ask the teacher to give me a suggestion. What should I do in this situation?