I haven't read anything already posted but I will suggest what I can.
Start with not caring so much, its a game. You lose in a game? You haven't lost anything really. You won in a game? You haven't won anything really.
There have been people who I don't get along with in a game. Some of them ass lick me, some use too much emojis, some are too immature for my age.. You probably have your tastes too and you don't want to be friends with everyone you meet here. That's fine. If you get rejected, its fine too. There are thousands of other players here that you can play with.
As for your age, it's not really a concern. I know a guy 5 years younger than me but we got along fine. Its about maturity.
If you are with people who are a bit older (or younger) and you notice that they don't crack lame jokes or talk about xyz a lot, it's best to avoid making lame jokes or talking about xyz with them.
Look at what they are doing, are they talking about abc? Ask them about abc. If they are talking about abc, they will definitely be interested in talking about abc with you, or even explaining you whats it about.
Are they more into action? Talk less more roleplay? Then do that. That's how you get along with people.
I won't say that you force yourself to do something that you don't want to do. But its entirely your choice.
If you want a group of friends, apply for some group. Before applying look at what you are looking for and look at what the groups usually do. Find your perfect group and apply. Groups look for people who stick for long (some are more lenient than others). I would keep a member who's not so great in roleplay but is good at something else. I would keep a member who isn't really good at anything but decides to stick with the group until/unless he's kicked. Of course, he must be willing to improve. So apply for one group, be active for it and you will eventually find more than enough friends to not get bored when in game.
All the best.
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