Anisha
Welcome to absolute normality.

Masturbation is the best fun you can have alone. I too, and I know without asking, that almost everyone here remembers looking forward to the next time I could do it again.

There is nothing abnormal about feeling and thinking differently after. As you get more secure with yourself and who you are, that will be less noticable.
As Cindy say, have a face to face chat with someone about it.
But take your time before making any decision, especially about your girlfriend.