It can get very lonely when you don't have a support system in the form of friends. I can understand how you May be feeling. Can I suggest that you go out more and invest some time making new friends. Introspecting and understating more about yourself will help you figure out what type of friends you would like in your life. Don't lose heart, you will make new friends, you will let go of old ones. Life is constantly changing. Change with it. Your feelings
will pass when you focus on yourself. Take up physical exercise or a sport. Deep breathing is very beneficial as well. If someone has hurt you in the past, forgive them and let go. Create space in your life for new friendships. Stay happy and healthy.