Over time you gain new friends and have different experiences with them, but you are always making new friends throughout your life. The question is when are you able to tell if these are your best friends who you do everything with. From personal experience it is hard to tell because you meet someone and gain new friends and are friends with them for a while but then you continue to meet new people. Friendship is complicated sometimes because you do not know if someone is being nice to you because of something you have they want or if they are just using you. Throughout your life you are going to meet people like that but you are also going to meet people who are really your friend and know what is best.
One place where this is able to happen is at college. When you are at college you are able to become friends with someone if you all have something in common with them. They may not be your best friends when you first meet them but you are going to grow closer as time goes on and they may even become best friends. From personal experience right now I have a great group of friends and we are all into hockey and other sports as well as sometimes going out to dinner as a group and having a great time. When you do this with your friend group you instantly know that you have found a group of friends who you are going to do a lot of things with. Although at first you think you have a lot in common with them, it is OK if you figure out that there are something that you want to do but they don't.
But the point to this is that you are always going to have your best friends with you no matter what even though you are into somethings that they are not. If you decide to do clubs and different activities you will meet other friends but it is OK if you do not feel as close to them. With me, I am very involved at school and my close group of friends who I play hockey with aren't that involved with clubs and different activities. Although it may be hard to have to go to a meeting rather than hanging out with that group, you just need to think to yourself that they are still your friends and maybe you can meet other friends in the club or activity you are a part of. You will know if they are truly your best friends if they tell you that you should keep doing the activity or club you are involved in and that we can do something else another night.
Knowing that you have close friends by your side you are able to enjoy yourself during college and find things to do on the weekends. Although sometimes it is hard to find that group of friends, you just need to keep an eye out for someone or a group of kids willing to accept you. Also just a little piece of advice, it is OK for you to have more than one group of friends who are into different activities.