How to approach a girl anywhere?

When i try to approach a girl two things happen
1. Before approach I feel negative thought he will not talk with me, i will make some thing stupaid stuff or or i ask something wrong came in my mind
2. If i approached I would not start a conversation with him or he would feel weird ๐Ÿ˜ž
Can someone guide me on this?
How to approach a girl anywhere?
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