Overthinking may either kill me or save me

I feel as though I overthink everything, and hold on to things too much. Im so stuck on how I want things to be and so ready to cling on, that I don’t seem to notice whats changing. I feel like I cling on too much and feel things too intensely. And I overthink to the point my overthinking causes the issues. It may be right and it may help me brace for things, but it may be wrong and I just cause myself more problems along the way. I never know what to do, or how to express it. Like I overthink peoples reactions to the point where I’m dead set that my worry of their reaction is going to be it. Like I just wanna cry. I wanna just know flat out what people think. I want to stop overthinking. I wish I could just be calm and cool and relaxed and fun with everything and I wasnt so worried about everyone and making everyone happy and trying to be the best person for each kind of relationship. God this was such a mess but I needed to say it.