I would like to know if it is possible to create my own God, and if so, will worshiping that god have the same value as worshiping others?
Of course you can. The power of God lies in the faith of his devotee. How did so many gods come to exist in Hinduism. Many people do not have the need to create one. They choose one among the existing Gods.
ये यथा मां प्रपद्यन्ते तांस्तथैव भजाम्यहम्। मम वर्त्मानुवर्तन्ते मनुष्याः पार्थ सर्वशः।।4.11।।
Howsoever men try to worship Me, so do I welcome them. By whatever path they travel, it leads to Me at last
यो यो यां यां तनुं भक्तः श्रद्धयार्चितुमिच्छति। तस्य तस्याचलां श्रद्धां तामेव विदधाम्यहम्।।7.21।।
Whichever form any devotee wants to worship, in that very form do I make his faith steadfast.
In the end all that matters is Bhakti.