How to tell my friends to give me some time for myself?

I'm an introvert and not everyday have the mood to talk. No offence to others, some times I want to quietly enjoy my life or just listen to others without talking. But my friends take it negatively. I usually fail to immediately reply people or constantly carry on a conversation (obviously things are different if it's something urgent). The similar things happen when I'm out with them. A few days ago a friend of mine approached me to go on a short trip with her. But as she kept on talking, I started losing the interest to talk and rather nodded and smiled. She then after some time got offended and said "I'm sorry, you probably don't like the place or my company". I don't even know how to convince her otherwise.

The same thing happens with my other friend who constantly text me and tells me pointless stuff that do not interest me. These texts include gossips, random self talks or stories about people I do not know. He replies immediately all the time, but I don't. Again, there's another dimension. He has a romantic liking for me but I am not into him.

I want to work on my university projects, read the books I like, watch the shows I love, enjoy some music, work on my writings and spend time working on my garden with my pets. But this just affects people and probably I attract people who need constant validation and attention. How do I make my friends understand that not everyone is an extrovert?

How to tell my friends to give me some time for myself?
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