Inside. Honestly, I'm not being glib. Until you know who you are, and what drives you, you cannot be a good partner, and you cannot find the answers outside of you. At one point in my life I realized I lived a very "noisy" active life. There was never any silence or time alone, just me and my thoughts. I was constantly generating noise/activity to avoid having to look inward and do any self-discovery. It took me a year of quiet contemplation, living in a foreign country, largely alone, before I became truly comfortable just being with myself. Everyone's journey is different, and only the few who truly dedicate themselves to it will achieve their goal of internal calm and confidence. But the process is worthy, no matter how far you take it.
Medication is like the third option. First is talking to a professional. They can help identify the issues, techniques for growth and managing those issues, and measurable milestones you can track to move forward. A key component of that will probably be dietary, honestly. Adjusting what you are eating, the quantities and variety, and addressing any underlying health issues (diabetes, fatty liver, IBS, or whatever), through dietary changes can fundamentally adjust your mentality. It's only after all of these options are exhausted that medication even enters the conversation. Because the docs have to know how your head and body are functioning, to figure out which medications might even work for your specific situation. So it isn't, "I'm bummed out", and the doc says, "ok, take this drug for the rest of your life". There's a whole process that addresses all of the different factors that go into making this bag of skin and bones operate optimally. But first you need to see a therapist and get the "head work" started. We are here, and we support you.