Uhm, a lot of people go through this phase in their lives. Have you tried talking to your friends, to see if they actually have a problem with you, or are you just imagining that there is a problem? You mention that you haven't been feeling great, well maybe how you are feeling is just putting a negative impression on everything happening. I know that when I feel upset or annoyed, I tend to feel angry towards a lot of people, or that people don't give me the attention I deserve etc.
Go to sleep tonight and just see how you feel in the morning. I then suggest you speak to your friends and ask them what the problem is, if any.