Confidence, shyness, and being almost 23

I've always been a very shy and reserved person. It's just my personality type as an INFJ but it's been more than just my personality. I'm shy out of fear of what people will think of me and I'm almost 23 and graduating college in two weeks and still struggle with this. I don't want to be pitied anymore for seeming weak and insecure. Some days I feel so secure and outgoing and positive and other days my insecurities take over my entire outlook on life. It's this constant push and pull and I wish it were different for me. I love myself and care so much about taking care of myself inside and out but I can't seem to let go of this. I have a fiancé who supports me in every way and knows every part of me and still I struggle to open up in other areas of my life. If you're reading this and can relate I want you to know that you're not alone and it doesn't make you less worthy than anyone else for dealing with this.