Try not to let your expectations get out of control. There's only so much you can get out of masturbation or casual sex, and it's mostly physical relief and a good time. If you're looking for something more, it's likely to end up a hollow experience. Don't put too much pressure on yourself. Don't worry about whether what you do is right or wrong or normal.
Sex is supposed to be fun.
Think of something funny, tickle her, make her tickle you, whatever it takes, have yourself a good, long, hearty laugh. It breaks the tension, raises your spirits, and keeps those rapidly plummeting vital signs elevated. Its really the best thing you can do for yourself. Alexis Williams has a Masters Degree in Public Health from Emory University. Her specialty is health education.