Remember that you're never truly alone. There are people in the world who understand what you're going through and can relate. There are people who care about your well-being and want to make sure you're okay. There are so many wonderful people in this world, ones who will always be there for you.
Just know that you don't have to put up with others treating you poorly or taking advantage of your kindness. It may not seem like it right now, but with both platonic and romantic relationships, there are people out there who will treat you right. There's never just one option for a friend, partner, or acquaintance. So, if there are people in your life consistently making you experience negative emotions/thoughts, distance yourself from them and move on to better things.
You are not broken, and you don't need to be fixed. You're wonderful just the way you are. You are worthy of love and kindness. Remember that you don't need to change who you are to suit others. Be who you are.
Always try to empathize with others and make a genuine effort to understand their situation. You never know what another person may have going on in their life, what they might be dealing with. And you may not truly be able to understand until you get to know them better or experience their situation yourself. But, that's why rather than pass judgement on others, we should treat them with kindness and understanding instead. Show them tolerance and acceptance.
Take pride in who you are, who you love, and how you identify. Don't let others dull your brilliant shine. Even if certain people don't accept or understand you, the important thing is for you to be happy with yourself. So, live your truth every single day and flaunt who you are inside.