>>2612063Beach is peak /out/, were I living there I would get into spearfishing, sea kayaking and swimming every day no excuses.
Also to answer directly to your original question, you can definitely change and embrace a more outdoorsy life, start by finding trails and going for hikes, as you get more comfortable you can venture off trail or overnights. Don't worry about experience, everyone starts somewhere, just have plenty of water with you and start going.
Btw don't be afraid to text your buddies to hangout, put some effort into it and don't let friendships fade away otherwise it will make your life worse.
Now go outside, good luck.