We are to show affection to one another. This is a command (1 Pet 5:14). It is normally not acceptable to refuse showing appropriate affection to other believers or to be unwilling to receive appropriate affection from them (Rom 12:10, NJB). To an even greater extent, we must be affectionate toward friends, family of origin, children, and our spouse. Friends may kiss each other in a non-sexual way (1 Sam 20:41). The same was even true of acquaintances (Lk 7:45). Parents and children in Scripture kissed one another (Gen 27:26). A husband and wife will kiss each other (SS 1:2). Kisses were normally accompanied by a warm hug.
What other expressions of affection are we expected to show? Doing good deeds such as helping and providing for another financially or giving gifts is surely part of this (Gal 6:6-10). Likewise, spending time with another and the verbal affection of encouraging words, compliments, and saying we love them would be included (Heb 10:24-25). Nevertheless, there is no denying that physical touch is also expected and commanded (Rom 16:16). We cannot excuse ourselves by saying that we are only comfortable showing affection through service and gift-giving but are uneasy about verbal and physical expressions of affection with a trusted other. (Keep in mind that not all expressions of affection are sincere or appropriate – Lk 22:48). Some forms of biblically-appropriate affection may be easier for us than others but all can be done, to some degree or another, with His help. If we continually seek to do our best, He will enable us to become increasingly better at expressing affection.
Showing affection is a way of encouraging another person. Everything we say is to build up and encourage others (Eph 4:29). This should also be true of our actions. Let us show love in word and deed (1 Jn 3:18).
Instead of being timid, learn to be appropriately bold.