I’m very sorry that you don’t have the family they you want or deserve. But family is a way of feeling, not just biology. You say you have a wide circle of close friends. They are your chosen family and can probably give you the emotional support you need if you let them. Please let them. That is probably the best antidote for stress there is.
It might also help you manage those difficult feelings if you learned some kind of meditation. Being fully present for even 20 minutes a day helps many people de-stress and relax. There are guided meditations on YouTube that you might find helpful. Also take a look at Jon Kabat-Zinn’s Mindfulness Based Stress Reduction (MBSR). He’s been researching the positive effects of meditation for some 30 years.
I wish you well.