You don't have to accept this is your life, if you really want it to be different, and it sounds like maybe you do (since you've considered internet dating).

Sure, it's scary to put yourself out there and risk rejection, or feeling weird about your lack of experience. Fact is, we all go through that. Even "experienced" people feel insecure with a new person. Anybody who has put themselves out there has had people they wanted to connect with and didn't, relationships that never really got off the ground, and those that ran their course and ended (naturally in a good way or even badly). When it doesn't work out with a specific person, that just means that's not the right person for you. It's not a reflection of either person's worth.

Less experience than those your age and extra weight are not necessarily negatives. Some guys like, even prefer, that.

If you decide to go for it, pay attention to the way a guy acts/behaves with you. That shows you who they really are, not what they say. The ones that are kind, considerate, respectful, those are the ones worthy of spending time with you. When it comes to the intimate stuff, don't worry about it. There's no right or wrong way. It's just important that it feels good and you're comfortable with what's happening. It's been different with every guy I've been with, because each combination of 2 people is different.