Intimacy and intercourse are a natural part of your life. Obviously, the operation has changed your body, but despite what we see in ads and movies, a perfect body isn't needed for a fulfilling life or a fulfilling sex life.
The sooner you start feeling comfortable about the changes to your body the better - it is not your stoma that determines your limitations in regards to intimacy!

Nothing good comes from anxiety
It's important to feel good, not only physically but psychologically as well. Anxiety and doubt affect both desire and sexual function - and it prevents you from focusing on your partner. Self-esteem and confidence not only make you feel better, they help your partner feel better as well.
It takes time to adjust
What is also important is acceptance - from both your partner and yourself. Avoid putting pressure on yourself and each other. Try and accept that it is ok if it takes a little while before your intimate life is what it was before.
Intimacy is more than intercourse
Remember that intimacy is much more than intercourse, and can be fulfilling and fun in its own right. Take time to enjoy simply touching each other, holding, cuddling and kissing – then feeling ready for intercourse might well come naturally in time.