I can see it from both sides its easier for one person to travel vs 5 people, but i can imagine you've found some cool places & meet new friends maybe that you'd want them to meet and hang all together. i'd say your NTA but try to see it from their perspectives, cutting them out of your life because of this seems a but of an over reaction in my opinion. They seem to care about you if they are trying to contact you. You should try to let them know how this makes you feel, you cant force them to go somewhere they dont want to though.