as I'm a real madrid fan, I'm rooting for real madrid to win this game and become champions, real madrid has a better squad compared to dortmund

the bookmakers are seeing real madrid as the clear favorite to win this game, it is not a balanced game because as I said, there is a big difference in quality between these two teams and real madrid is superior
Bookmakers and odds can show the favorite team but in a direct match, a stronger and favorite team are not always winner at the end. Real Madrid from history to their player quality and performances in this season, are considerable stronger than Dortmund and given odds before the final shows this.
They will take the fifteenth Champions League title if they win this one and there are some people who either fans of Dortmund or fans of other clubs don't want it to happen. Clubs like AC Milan, Bayern Munich, Liverpool and Barcelona with 7, 6, 6 and 5 titles probably support Dortmund in this final.
It could be said that the team that once failed in the UCL now has high hopes for Dortmund to be able to thwart the 15 trophies that Real Madrid wants to collect. I feel a great atmosphere of support for the Dortmund players.
But whatever it takes to win the trophy in the final, Real Madrid will show a different game, perhaps even beyond expectations. I also don't think Dortmund will control this match. Ancelotti and his troops are taking this opportunity seriously. 15 trophies will motivate Real Madrid players to play optimally. The biggest challenge is that Dortmund must break Real Madrid's dominance on the field.