How do I fit in

Think about your values, interests, lifestyle preferences and goals.
Move to a place where the majority of people share the same or similar.
Get involved in regular activities related to those things.
You will thus meet as many like-minded people as possible and some of those, over time, will become good friends.
It is actually much easier to create a family-of-affiliation that to deal with a family of blood relations.

If you have any difficulties with communication, conflict resolution, or relationships, be proactive, seek help (such as free online advice from articles in the magazine Psychology Today - or videos of Marshall Rosenberg's NVC).

Don't look to replace that, your grandma gave you her most. Like she loved you sooo much.
Try figure out who you are away from her. As for people go with the flow.
Lower your expectations a few notches.
People can be amazing but not when they jumping through immeasurable hoops.

Parental love is different to the love we find in others.

Good luck! This is an exciting chapter.

Just start winging it

What kind of lady was your Grandma? Just try to be the person you want to be and the friend you would want to have.