25 female, doing my PhD in Europe right now and i totally understand ur point. I also had that issue where everyone around me (cousins and friends) is getting married and are not interested in pursuing in their studies. Believe me or not, more than half my relatives were against me coming here to do my PhD😂. They didn't understand why i had to do that being like "its time for u to get married not study for another 4 years. U r not getting any younger. why do you even have to do all that? Isn't ur masters enough?" But i came anyway. Just like u I wanna travel and all but I also want to married👰‍♀️ The close friends i have near me right now r way older than me. (men in their mid thirties😂) Its normally hard to find people that are in ur spectrum but my advice is try getting close with ur classmates and coworkers (if u work). If u r an introvert, at least don't miss on opportunities that require group work like group assignment, meetings and group celebrations, it will give u the excuse/force u to talk to people. I met most of my friends through group assignments😄