How do i not feel lost, or lonely when I’m surrounded by people?

I am sorry to hear about being strung along by someone. I think it's important to realize your time and life are valuable, if you want a exclusive relationship, and this person has told you they don't want the same I think its best to move on and keep dating. When you don't have similar goals with a partner you are seeing, this can cause for discord and you will feel resentment if they aren't wanting to commit to a relationship but you do. Realize that they aren't your ideal partner, because if they were you would be in a relationship and feel the same way. Reciprocity is very important in romantic relationships, as we can only control our own feelings, and if you want to grow and be in a healthy relationship its best to let go of things not serving you. 

You may be feeling quite alone and down due to moving back in with your parents but this is a common feeling. I don't know the reason you moved home but I try to remind people to look for the positive to this occurring. I do know changes can be hard and feel like one is moving backwards, but often this is a time to re-adjust your life plans and determine the next steps while home, this may be a change your life in some way, which includes a move, new job or new hobbies or interests you wanted to try. I would also put time into re-establishing relationships with your parents as an adult.

When one is grown you may realize your parents offer care and wisdom that is valuable. If you can find the silver lining to this time, you will feel better about it when you reflect, and this time will only be a short period of time in the span of your life. When it comes to your friendships I say also reevaluate what you are wanting in friends. Are these people supportive of you and your changes, do you feel they are there for you during your breakup? Keep your head up, find ways to find gratitude, and take time to take care of your needs as well, this includes taking time to better yourself, heal and learn how to make lemonade out of lemons. Therapy is a great thing to do during this time of transition to grow and discover all the great things about yourself.