Hi, Yes, I'd say absolutely at 27 you can start to discover who you really are!! In fact you can start doing that at any age with the right conditions AND 27 is still fairly young, really!!
So it's great that you're starting on that road in having reached out for help. It sounds like you've had a lot going on for you up until (and including!) now. Do you think that maybe you didn't have the right support or found it difficult asking for/looking for that in your adolescence? I can see how that period must have been really hard for you without people close to you and understanding/supportive.
Although being different absolutely doesn't have to be bad, it's good to have people around who allow you to see/feel that too and accept/like who you are................and not too many of them for you??
But WOW (!!) you pulled yourself of the path that led you too..........you walked away from the heroin!! Now that was massive!! So you do
seriously have some strength and resolve in there, even if you're not giving yourself credit for that!!
And worthlessness after what you've been through and come though????????!!!!!!!
I
really aren't undermining your feelings and I do know that depression can be SO hard and of course the feeling of worthlessness comes alongside but as long as you're getting my message on "worthless"
just a little, tiny bit???? And maybe try to see your feelings (although I'm sure are VERY real!!) a little less about YOU but more so about "depression" instead. And with some help, and
maybe a little bit of a fight (but we DO know you CAN do that!!) then..................
Now you do know I've got to mention the drink and marijuana, right?

Drink: depressant and all that, really can't be helping........marijuana.....................
I
seriously don't want to undermine you having kicked the heroin but it's got to be something you're aiming at at least reducing right now. Or maybe AA is something you might consider at some point if it is holding you back from all you could be/want to be??
OK lecture done

And yes it's completely understandable how you feel things are going nowhere, there might not be much more BUT with help then there will be a bigger picture out there. More choices you may want to make in where you're going in life, more things you really want to be doing, and more options/opportunities.
And you know when we're talking about starting to discover who you are, I'm thinking that you've already been discovering who you are
underneath a bit (in part thanks to your life NOT "being a lie"). You HAVE shown a LOT of strength and strength of character in getting where you are today. NOW it's just about getting the help you need to feel better about yourself/your life and moving it on to where you want to be "tomorrow". I DO know that may not be easy but you're on your way!!
Here for you
Alison