Every day is a new adventure, full of new and amazing things to discover. So get out there and search for them. Broaden your horizons and explore as much of life as you possibly can.
Remember to enjoy each and every day to the fullest. Our time here is limited, and we never know when that time might end. So, do the things you love, spend time with the people you love, and lead a life that makes you truly happy.
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.
It's easy to become discouraged seeing other people who can create art, play sports, make music, cook, and do a variety of other activities so well. You may feel as if you don't measure up or have a special talent like they do. However, you're brimming with certain talent and limitless potential. You just need to find the talents and skills that are right for you.
Know that your feelings are completely valid, always. Your emotions are your own, and they're important because they're important to you. You have the right to feel whatever emotions you feel at any given time. And you're not wrong for feeling a certain way.