Appreciate yourself
Good people tend to care for the welfare of others more than their own. This is a very common fact too when it comes to relationships.
Pleasing your girl's likes can't go over your feelings or possibilities. You can't always cancel appointments to see her, you can't always pay for anything she wants, and you can't always hide what you really want to do just because it would bother her. Believe it or not, this wears you out little by little.
Everything we suppress doesn't go away but accumulates. We are like a balloon that fills with air, but instead of air they are feelings, and instead of a balloon it is a complacent man.
At some point, the balloon will not hold anymore, and it will explode so much that it will end up damaging the relationship. This can be avoided if instead, we express what we feel without fear at the moment that matters.
If you feel like going out with your male friends, do it and if you want to talk to your female friends, do it too. Don't let someone else's jealousy or insecurities consume you.
If something about her bothers you, tell her, and if the problem makes you unhappy, walk away. The breakup will cause you sadness in the short term, but surely it will be nothing compared to what it would cause in the long term.
You are unique and special no matter what your characteristics are. There is the right person for each of us out there. Don't stay where your love and dedication are questioned or unrequited, where she only wants you for your money.