How can I improve myself and my life?

So my question is what would you advice a 21yo? Im in a good place right now but I feel like I could do better especially in the social life. I have hard time making friends and I always doubt myself regarding if people would like me or not. I just moved on to another country and just want to start a new life but I have a hard time doing that. I also want to know how do I take care of myself and just be clean and beautiful? Thank youuu