Hi, I was once a shy kid but now I can make friends with anyone. here are my top tips
1) MOST IMPORTANT, you have to learn to say "Hi" first, people find it very hard to say "hi" first so try this . This worked wonders for me
2) Realise that being nice will not make you popular, being too nice will just make you look weird, You should try to ask questions about them and try to relate to them.
"Yo mate , how you doing? You look kinda nice in that hat , sheeesh." " you look like you also like designer, what brands you into?"
(you don't have to say "sheesh" btw)
3) be yourself , nobody likes fakes. be loyal aswell. Don't sound like you have no interest in talking to them because nobody likes people who sound like they are only talking to you because they have no one else . make them feel special and tingly.Good luck dawg