First of all, make clear why you have no friends. Is it because we really don't need it, so we don't have friends around us, or is it difficult to make friends? If it is because we are more willing to focus on our own development and improvement, then we don't have to doubt ourselves. Of course, today's society pays attention to cooperation, and we don't need friends, but we should also learn and adapt to getting along with others and accomplish tasks together. Otherwise, it will affect our own work progress and our relationship with colleagues. If you find that you have no friends because of your own reasons, correct it and learn to get along with others. Try to trust others and treat others sincerely, and you will always meet friends.
Second, self-doubt is pros and cons. You doubt your communication ability, so in your communication ability, have you examined yourself and let yourself know? If you can't feel or feel it, please ask your colleagues, family members or teachers around you to observe yourself, make an evaluation for yourself and reflect through others' evaluation.
What each of us should do most is self-reflection. Experience and self-reflection can help us grow well. Friends are a very important part of each of us, so please add some friends to yourself. It is a very happy thing to get help and dependence from friends.