how to have a good summer?

hi i’m 18(f) and i have only got a couple of distant friends. my bestfriend passed 3 weeks after my 17th birthday and i’ve just been so lonely. people reach out and i am so grateful for that but i feel awkward inviting myself out with people idk. my question is can i have a fun summer without having lots of friends and has anyone got any ideas? last summer was a mess because i was grieving her and obviously quarantine but now i am in a different stage of grief. i feel so much more confident and able to smile and have fun! so yeah this post wasn’t for pity i just genuinely need some ideas! i will appreciate any answers thank you :)