No friends, lost, unimportant

I haven't felt like myself in about a week. There were a couple days where I felt good and loved but yesterday and today I feel like my friends or family don't reach out to me. I feel unloved, unwanted and lost. I don't have many girlfriends especially since they all have long term boyfriends. My older sister is judgemental and I can't be around that negativity. I go to therapy and group therapy which helps build me up but this week has been so difficult. Why do I always have to reach out to my friends and family to hang out? Sometimes I want to feel wanted and missed by my friends and family. I am at the beach alone because I wanted to go today but I look around and see so many families and friends together. I think to myself I have been coming along for so many years. No boyfriend, no one person who enjoys my consistent presence, someone who enjoys life with me. I feel lost and unimportant today. I am outgoing and friendly but I am always alone..

Does anyone go through this? If so, how do you try and meet new people? Or do you stay alone?