Sharing Our Innermost Thoughts

How can I can end the feeling of guilt when i know i am doing something which is important myself why i can’t let it go why i think how the other person will think if i chose to be selfish for once . I regret things cause in a way my mind is continuously battling with the thoughts that i have might hurt them n that’s why i can’t be happy n eventually i feel sad . Most of the times i am overthinking about what others think n how they felt but sad part is no body cares abt my feelings lol and even i can’t end overthinking about it. I hope i can change cause these thoughts only gives me pain, i seriously even tried my best to change but i was unable to control my emotions most of the times.