@Katt You shouldn’t feel any less of a witch just because you can’t practice in the open. Witches have been practicing in secret for hundreds of years! 
Besides, there isn’t any one “true way” to practice. Most of the time your Craft has to adapt to your lifestyle.
Research sigil Magic. For example, draw sigils in hidden places such as notebooks, your phone case, wallet, purse, skin, cosmetics, clothing, etc. If anyone asks what you’re doing, it’s just “arts and crafts”.
Your altar can be very minimalistic and made of everyday things. It’s “just decoration”. But you’ll know the intent behind each item!
Light tealight or birthday candles in your free/private time and meditate. Practice visualization and energy work, as those are the best witchy things to do without any tools.