There is not one diver in the world who can do it all. It does not matter who you are, there is always someone who has done more dives, been deeper, taught more students, done more deco etc etc etc.
To gain experience you need to be sensible. An instructorial example.
I have not dived for two years. I have done a few thousand dives before that, in both extremely warm and extremely cold water.
I have lots of new kit (well, its a year old, but not been used)
I class myself as an experienced diver. So, I have a Friday off, and I choose to go diving in Stoney Cove. Nice controlled environment ... Nice and safe. I did two dives, each lasting an hour at 15-20 metres. Why?
Because I needed diving experience. My buddy was basically a gear carrier ... do I need a hood? did I need gloves, practicing the skills that I took for granted when I taught and dived everyday.
I read somewhere that an amateur practices until he gets it right, and a professional practices until he cannot get it wrong.
Join a dive shop club and talk to people. Talk to people about their opinions on dive gear, dive sites and dive techniques. Most things you will hear sound common sense, some things you hear will be complete B/S, but there will be a little nugget that you hear that you think "Holy Cow!!! how simple, why dont I do that?" then you will try it out and it will either work or it wont.
People are your best source of experience, and any diver who is just out for a dive, should not really mind if you beleive you are inexperienced, if you want to tag along.
One of my best teachers was not an instructor, but he was a very patient guy called John Irving. He and I used to buddy up on a Saturday deep dive, when I worked as a cox'n/DM in a LDS south of Chichester. He had a thousand dives, I had less than 100, but throughout the summer he gave me time to practice my deep diving skills until we managed to dive a very deep wreck off Brighton at the end of the summer that year. I learnt more from talking to him and listening to him talking to others than at any time since.
If you ever see me at a dive site (cant miss me, loud, obnoxious ... and "Belushi" on my dry-suit) say hello and we can chat and have a half of sherry-tops!! after the dive ... and yep, I will dive with you if you are short of a buddy