lots of them i have thrifted (from online instagram stores and thrift stores, thrift apps) and the other part is mostly bought on fantasmagoria (online store, has brands like punk rave, etc)!
it took me a lot of time to actually feel comfortable to change my style like i did, and feel comfortable to wear stuff i do now, i think searching the internet and seeing different people being cool helped me a lot, special thanks to vkei and j-fashion for having such a huuuuge influence on me
i think you should def do research on what kind of fashion you like!! and take your own time to change styles if thats the case, you should always check out for thrift stores, both irl and online, instagram accounts and apps used for thrifting! you can always find a thing or two online ^^