I’m so sorry that your first ventures into love and relationships have gone so badly. You are at an age where lots of teens start trying out what it means to be in a relationship. Often these attempts are awkward and clumsy and sometimes they are hurtful. My guess is that what you are interpreting as personal rejection is more likely that the girls involved don’t know what they are doing either. Your friends can’t help because they are in the same stage of development as you are.
One of my teen clients explained finding a relationship this way: When you go into a store to try on jeans, you don’t blame yourself if a pair of jeans doesn’t fit. You try on another pair, and another, and another until you find the pair that fits just right. Along the way, you learn what brand and cut is more likely to work. Or maybe you learn that you look better in pants than jeans. It’s a process.
Early efforts at making a relationship is sort of like that. All you can do is do your best and learn from each attempt how to make a better choice, then how to communicate better and how to please another person who is interested in pleasing you.
You are far too young to give up on love. Accept the process. It’s the only way you will find true love when the time comes.
I wish you well.