Do you sometimes feel like you failed something to be pregnant ?

Ju
Tomorrow it's the birthday of my husband. That's 5 months we try (I've 25days cycles), I hoped have a great announcement to do but I tested and I'm not pegrant. Today a friend who tried for only one month sent me her positive test. I'm happy for her but now I just want to stop. I know 5 months that's not a big time but I feel like a looser every times I have my period. Hope I'm pregnant is very difficult, I'm not sure I can do that more longer :( 
Any advices to cheer me up ?