Need talk

Am m20 and i dont have gf, due to am introvert. And am scared, if i will have gf, we will spend a lot of time together (few hours per day for exapmle) and am scared that the topics will run out (to talk). And i dont know how to kiss. I had gf, when i was 15 yo, but we break up after 1month (we never kiss each other, just hugs). Am scared also, due to partner can cheat on you, lie to you, manipulate you, be toxic etc......

What benefits have relationship?