Infinitely easier. I'm in my late 20s now. My teenage years were entirely reclusive, incredibly painful and unbelievably lonely. I was bullied and mistreated, had nobody to speak to and felt like I was failing at everything. I'd gone from 'genius' to 'barely getting by' at school, and I was completely alone. Then, to end those teenage years, I started university hoping for a fresh start in life and found the same issues all over again! No magic cure. At the time I didn't know that I was probably on the spectrum, so my thoughts were "Hey, nobody will know what a loser I was growing up, so if I make an effort at university I should be able to make friends". Needless to say, that didn't work - I could act more confident, but ultimately I quickly crashed and burned.
However in my case, I met a guy that gave me a chance and became my friend and introduced me to his social group. He was incredibly popular, but that way because he was genuinely nice to people. We became very close friends, ended up in a relationship in our early 20s, and things moved on and now we're married and have a child.
It's a wonder there was any hope left for me in life! I know that hopeless and depressed feeling all too well. But it takes just one small thing - one person, or one bit of luck elsewhere in life - to turn it all around. My husband has provided so much support to me, he's changed my life more than anyone could ever imagine, and I'm now the happiest and proudest mum as well as being the happiest and proudest wife.
That's not to say there aren't still struggles, just that now I'm struggling beside someone understanding and mature. I still face some of those immature attitudes - some grown adults have certainly acted towards me the same way the teenagers in school and young adults in university did - but it's rarer now. For the most part, at my age, people are civil and respectful; they may drift out of your life, but they do it quietly and without a big fuss, and some will even be tactfully honest that you're not 'their kind of person' which is a hell of a lot better than what you get from bullies. I can now socialise to some extent. I'm never going to be the person that goes out for fun, but I go out for my daughter's sake and the other parents talk to me even if I don't really have close friendships, and I go out to do business networking and I do alright with the small talk.
I know I'm not great at any of it. I'm never going to be the best socially, and it does hit you hard emotionally to know that, but the world is more accommodating of my differences than it has been in the past. Adults are much better at letting you in, even if you know that it's not ideal for them, and you're also able to enjoy the independence that comes of being able to make your own decisions at all times. Don't like something? Change it!